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View All : Main > Topics > AC Circuits
Category: Circuit Elements/
diagram_thumbnail Problem 1

Determine the equivalent impedance at the terminals A-B when the circuit operates at a frequency of 50 rad/s.

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
  • Complex Arithmetic
Length: 4:02    Date Added: 2007-07-17 10:02:09    Filename: ac_cktels_equiv_ex1_eng    ID: 297
diagram_thumbnail Problem 4

Find the equivalent admittance seen by the current source.

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
Length: 6:52    Date Added: 2007-07-26 08:54:05    Filename: ac_cktels_equiv_ex4_eng    ID: 313
diagram_thumbnail Problem 3

State the value of the single equivalent resistor and capacitor (or inductor) seen by the source.

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
Length: 5:58    Date Added: 2007-07-26 08:56:10    Filename: ac_cktels_equiv_ex3_eng    ID: 314
diagram_thumbnail Problem 5

Determine the equivalent admittance between the terminals G-H. Work this problem completely in terms of admittance.

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
Length: 2:35    Date Added: 2007-07-26 09:11:06    Filename: ac_cktels_equiv_ex5_eng    ID: 315
diagram_thumbnail Problem 6

Determine the equivalent impedance between the terminals G and H. To begin, convert the admittance of each element to impedance, then work the problem completely in terms of impedance.

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
Length: 5:06    Date Added: 2007-07-27 09:39:53    Filename: ac_cktels_equiv_ex6_eng    ID: 365
diagram_thumbnail Problem 2

Determine the equivalent impedance between the terminals C-D when the circuit operates at each of the following frequencies: 0 Hz (DC), 503 Hz, 5.03 kHz, 50.3 kHz, and ∞Hz (extremely high frequency).

AC Circuits > Circuit Elements > Equivalent Impedance/Admittance
Keywords:
Length: 5:40    Date Added: 2007-07-27 10:06:07    Filename: ac_cktels_equiv_ex2_eng    ID: 368
Category: Admittance/
diagram_thumbnail Problem 2

Match the admittance value to its corresponding circuit element.

AC Circuits > Circuit Elements > Admittance
Keywords:
  • Complex Arithmetic
Length: 4:34    Date Added: 2007-07-17 10:02:09    Filename: ac_cktels_admit_ex2_eng    ID: 296
diagram_thumbnail Problem 1

Complete the table to show the admittance of each of the indicated circuit elements at various operating frequencies.

AC Circuits > Circuit Elements > Admittance
Keywords:
  • Complex Arithmetic
Length: 5:16    Date Added: 2007-07-17 10:44:42    Filename: ac_cktels_admit_ex1_eng    ID: 310
Category: Impedance/
diagram_thumbnail Problem 1

Complete the table to show the impedance of each of the indicated circuit elements at various operating frequencies.

AC Circuits > Circuit Elements > Impedance
Keywords:
  • Complex Arithmetic
Length: 3:55    Date Added: 2007-07-17 10:02:09    Filename: ac_cktels_imped_ex1_eng    ID: 298
diagram_thumbnail Problem 2

Match the impedance value to its corresponding circuit element.

AC Circuits > Circuit Elements > Impedance
Keywords:
  • Complex Arithmetic
Length: 3:51    Date Added: 2007-07-17 10:02:09    Filename: ac_cktels_imped_ex2_eng    ID: 299
Category: Sinusoids/
Category: Kirchoff's Laws/
diagram_thumbnail Problem 1

Use KVL to find the unknown phasor voltage V.

AC Circuits > Sinusoids > Kirchoff's Laws
Keywords:
Length: 4:19    Date Added: 2007-07-26 11:25:56    Filename: ac_phasors_kcvl_ex1_eng    ID: 336
diagram_thumbnail Problem 2

Find the time-domain expression for i(t) using phasor techniques.

AC Circuits > Sinusoids > Kirchoff's Laws
Keywords:
Length: 3:59    Date Added: 2007-07-26 11:29:38    Filename: ac_phasors_kcvl_ex2_eng    ID: 337
diagram_thumbnail Problem 3

Use KVL to find the amplitude and phase of v(t) using phasor techniques.

AC Circuits > Sinusoids > Kirchoff's Laws
Keywords:
Length: 5:45    Date Added: 2007-07-26 11:32:49    Filename: ac_phasors_kcvl_ex3_eng    ID: 338
diagram_thumbnail Problem 4

Find the time-domain expression for i(t) using phasor techniques.

AC Circuits > Sinusoids > Kirchoff's Laws
Keywords:
Length: 4:51    Date Added: 2007-07-26 11:35:41    Filename: ac_phasors_kcvl_ex4_eng    ID: 339
Category: Properties/
diagram_thumbnail Problem 1

Determine the following properties for each of the given sinusoidal voltages: amplitude, peak-to-peak value, cyclic frequency (in Hz), angular frequency (in rad/s), period, and phase.

AC Circuits > Sinusoids > Properties
Keywords:
Length: 3:35    Date Added: 2007-07-26 13:38:14    Filename: ac_sinusoids_properties_ex1_eng    ID: 352
diagram_thumbnail Problem 2

Given the table that describes three sinusoidal currents. Write the mathematical expression for each current in the form i(t) = Imcos(ωt+Φ).

AC Circuits > Sinusoids > Properties
Keywords:
Length: 3:03    Date Added: 2007-07-26 13:49:49    Filename: ac_sinusoids_properties_ex2_eng    ID: 353
diagram_thumbnail Problem 3

Express the voltage v(t) in the form Vmcos(ωt+Φ)

AC Circuits > Sinusoids > Properties
Keywords:
Length: 4:14    Date Added: 2007-07-26 13:55:48    Filename: ac_sinusoids_properties_ex3_eng    ID: 354
Category: RMS Value/
diagram_thumbnail Problem 1

Given the periodic voltage waveform v(t). Determine its average value and its RMS value (also known as its effective DC value).

AC Circuits > RMS Value > Arbitrary Waveform
Keywords:
Length: 6:22    Date Added: 2007-07-17 10:02:09    Filename: ac_rms_arb_ex1_eng    ID: 302
diagram_thumbnail Problem 2

Given the periodic current waveform i(t). Determine its average value and its RMS value (also known as its effective DC value).

AC Circuits > RMS Value > Arbitrary Waveform
Keywords:
Length: 0:00    Date Added: 2007-07-17 10:02:09    Filename: ac_rms_arb_ex2_eng    ID: 303
Category: Sinusoid/
Problem 1

Find the average value and RMS value (also known as its effective DC value) of the sinusoidal voltage v(t) = VMcos(ωt). Use the mathematical definitions of average and RMS value.

AC Circuits > RMS Value > Sinusoid
Keywords:
Length: 5:05    Date Added: 2007-07-17 10:02:09    Filename: ac_rms_sinusoid_ex1_eng    ID: 304
Problem 2

Find the average value and RMS value (also known as its effective DC value) of the sinusoidal voltage v(t) = VDC + VMcos(ωt), a sinusoid with a DC (constant) offset. Use the mathematical definitions of average and RMS value.

AC Circuits > RMS Value > Sinusoid
Keywords:
Length: 4:23    Date Added: 2007-07-17 10:02:09    Filename: ac_rms_sinusoid_ex2_eng    ID: 305
diagram_thumbnail Problem 1

Find the transfer function for H(jω)= Vo/Vi

AC Circuits > Frequency Response > Second-Order Bandpass Filter
Keywords:
Length: 6:18    Date Added: 2007-07-26 09:18:51    Filename: ac_freq_activebpf2_ex1_eng    ID: 316
diagram_thumbnail Problem 2

Design a second order bandpass filter with cutoff frequencies of 100 Hz and 100 kHz and a passband gain of 10.

AC Circuits > Frequency Response > Second-Order Bandpass Filter
Keywords:
Length: 6:28    Date Added: 2007-07-26 09:26:04    Filename: ac_freq_activebpf2_ex2_eng    ID: 317
diagram_thumbnail Problem 3

Find the transfer function H(s)=Vout/Vin. What type of filter is it?

AC Circuits > Frequency Response > Second-Order Bandpass Filter
Keywords:
Length: 8:25    Date Added: 2007-07-27 13:47:25    Filename: ac_activebpf2_ex3_eng    ID: 398
Category: Active Filter/
diagram_thumbnail Problem 5

Find the cutoff frequency of the filter. Use voltage divider to derive the transfer function. Obtain the output voltage in s.s.s when the input voltage is Vin=1cos(100t) V and Vin=1cos(10,000t+90°) V.

AC Circuits > Frequency Response > Active Filter
Keywords:
Length: 8:17    Date Added: 2007-07-26 09:51:52    Filename: ac_freq_activefilt_ex5_eng    ID: 318
diagram_thumbnail Problem 1

a) Find the transfer function H(jω)=Vout/Vin

b) At what frequency will the magnitude of H(jω) be maximum and what is the maximum value of the magnitude of H(jω)?

c) At what frequency will the magnitude of H(jω) be minimum and what is the minimum value of the magnitude of H(jω)?

AC Circuits > Frequency Response > Active Filter
Keywords:
Length: 6:14    Date Added: 2007-07-27 11:26:16    Filename: ac_freq_activefilt_ex1_eng    ID: 378
diagram_thumbnail Problem 2

Obtain the output voltage in s.s.s for the input voltage is Vin=1cos(100,000t+45°) V.

AC Circuits > Frequency Response > Active Filter
Keywords:
Length: 6:02    Date Added: 2007-07-27 11:30:14    Filename: ac_freq_activefilt_ex2_eng    ID: 379
diagram_thumbnail Problem 3

a) Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in Fig. 1.

b) What is the cutoff frequency of the filter?

c) Design the filter with the circuit give in Fig. 2. Find the values of C and Ri.

AC Circuits > Frequency Response > Active Filter
Keywords:
Length: 7:09    Date Added: 2007-07-27 12:50:39    Filename: ac_freq_activefilt_ex3_eng    ID: 381
diagram_thumbnail Problem 4

a) Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in Fig. 1.

b) What is the cutoff frequency of the filter?

c) Design the filter with the circuit give in Fig. 2. Find the values of Rf and Ri.

AC Circuits > Frequency Response > Active Filter
Keywords:
Length: 5:06    Date Added: 2007-07-27 12:54:05    Filename: ac_freq_activefilt_ex4_eng    ID: 382
diagram_thumbnail Problem 1

Design a second order lowpass filter with a cutoff frequency of 500 Hz and a passband gain of 10. Use 0.1 μF capacitor.

AC Circuits > Frequency Response > Second-Order Lowpass Filter
Keywords:
Length: 9:25    Date Added: 2007-07-26 10:06:22    Filename: ac_freq_activelpf2_ex1_eng    ID: 319
Category: Bode Plots/
diagram_thumbnail Problem 1

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagrams shown in the figures.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 3:59    Date Added: 2007-07-26 10:10:00    Filename: ac_freq_bode_ex1_eng    ID: 320
diagram_thumbnail Problem 2

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagrams shown in the following figures.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 3:07    Date Added: 2007-07-26 10:15:34    Filename: ac_freq_bode_ex2_eng    ID: 321
diagram_thumbnail Problem 3

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in the figure below.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 2:33    Date Added: 2007-07-26 10:18:36    Filename: ac_freq_bode_ex3_eng    ID: 322
diagram_thumbnail Problem 4

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in the figure below.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 2:09    Date Added: 2007-07-26 10:21:45    Filename: ac_freq_bode_ex4_eng    ID: 323
diagram_thumbnail Problem 10
problem_statement.gif
AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 4:43    Date Added: 2007-07-27 12:59:10    Filename: ac_freq_bode_ex10_eng    ID: 384
diagram_thumbnail Problem 5

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in the figure below.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 3:34    Date Added: 2007-07-27 13:01:16    Filename: ac_freq_bode_ex5_eng    ID: 385
diagram_thumbnail Problem 6

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in the figure below.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 2:55    Date Added: 2007-07-27 13:03:05    Filename: ac_freq_bode_ex6_eng    ID: 386
diagram_thumbnail Problem 7

Obtain the transfer function H(jω) corresponding to the Bode magnitude diagram shown in the figure below.

AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 1:43    Date Added: 2007-07-27 13:05:00    Filename: ac_freq_bode_ex7_eng    ID: 387
diagram_thumbnail Problem 8
problem_statement.gif
AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 4:52    Date Added: 2007-07-27 13:06:54    Filename: ac_freq_bode_ex8_eng    ID: 388
diagram_thumbnail Problem 9
problem_statement.gif
AC Circuits > Frequency Response > Bode Plots
Keywords:
Length: 7:59    Date Added: 2007-07-27 13:08:57    Filename: ac_freq_bode_ex9_eng    ID: 389
Category: Bandpass Filter/
diagram_thumbnail Problem 1

Find ω0, ωc1, ωc2, Q and β

AC Circuits > Frequency Response > Bandpass Filter
Keywords:
Length: 5:55    Date Added: 2007-07-26 10:25:38    Filename: ac_freq_passivebpf_ex1_eng    ID: 324
diagram_thumbnail Problem 2

Derive the expression for H(s)=Vout/Vin. What type of filter is it? Find ω0, Q and β.

AC Circuits > Frequency Response > Bandpass Filter
Keywords:
Length: 6:08    Date Added: 2007-07-26 10:29:37    Filename: ac_freq_passivebpf_ex2_eng    ID: 325
Category: Bandreject Filter/
diagram_thumbnail Problem 1

Derive the expression for H(s)=Vo/Vi. What type of filter is it? Find ω0, ωc1, ωc2, Q and β.

AC Circuits > Frequency Response > Bandreject Filter
Keywords:
Length: 6:53    Date Added: 2007-07-26 10:33:07    Filename: ac_freq_passivebrf_ex1_eng    ID: 326
diagram_thumbnail Problem 2

A radio receptor is often disrupted by 8 kHz whistle. Design a "whistle-stop" filter that has a bandwidth of 1 kHz and uses 33 nF capacitor.

b) The previous example is ideal and will completely eliminate the 8 kHz whistle. However, circuits are not ideal so let’s assume that the inductor has 2 Ω resistance and the source has 50 Ω resistance. If the filter specification calls for -18 dB, will the specification be met?

AC Circuits > Frequency Response > Bandreject Filter
Keywords:
Length: 8:02    Date Added: 2007-07-27 13:13:02    Filename: ac_freq_passivebrf_ex2_eng    ID: 390
diagram_thumbnail Problem 3

a) Determine H(s)=Vout/Vin for the circuit in the figure.

b) What is the maximum magnitude of the transfer function?

c) What is the minimum magnitude of the transfer function?

d) What type of filter is it?

AC Circuits > Frequency Response > Bandreject Filter
Keywords:
Length: 10:13    Date Added: 2007-07-27 13:15:20    Filename: ac_freq_passivebrf_ex3_eng    ID: 391
Category: Highpass Filter/
diagram_thumbnail Problem 1

Find the transfer function for H(jω)=Vout/Vin. What type of filter is it?

AC Circuits > Frequency Response > Highpass Filter
Keywords:
Length: 4:34    Date Added: 2007-07-26 10:36:36    Filename: ac_freq_passivehpf_ex1_eng    ID: 327
diagram_thumbnail Problem 2

Find the transfer function for H(jω)=Vout/Vin. What type of filter is it? What is the cutoff frequency of the filter?

AC Circuits > Frequency Response > Highpass Filter
Keywords:
Length: 5:10    Date Added: 2007-07-26 10:42:19    Filename: ac_freq_passivehpf_ex2_eng    ID: 328
diagram_thumbnail Problem 1

The series RLC bandreject filter is shown in the figure below. It has a center frequency of 1 rad/s. Use scaling to compute new values of R and L that yield a circuit with a center frequency of 100 krad/s. Use 1 nF capacitor.

AC Circuits > Frequency Response > Magnitude and Frequency Scaling
Keywords:
Length: 9:12    Date Added: 2007-07-26 10:45:42    Filename: ac_freq_scaling_ex1_eng    ID: 329
Category: Transfer Function/
diagram_thumbnail Problem 1

Find the transfer function H(s)=Vo/Vin

AC Circuits > Frequency Response > Transfer Function
Keywords:
Length: 5:08    Date Added: 2007-07-26 10:49:21    Filename: ac_freq_transfnc_ex1_eng    ID: 330
diagram_thumbnail Problem 2

Find the transfer function for H(s)=Vo/Vi.

AC Circuits > Frequency Response > Transfer Function
Keywords:
Length: 5:40    Date Added: 2007-07-26 10:52:04    Filename: ac_freq_transfnc_ex2_eng    ID: 331
diagram_thumbnail Problem 3

Find the transfer function for H(s)=Vo/Vi.

AC Circuits > Frequency Response > Transfer Function
Keywords:
Length: 6:46    Date Added: 2007-07-26 10:54:26    Filename: ac_freq_transfnc_ex3_eng    ID: 332
diagram_thumbnail Problem 1

Use the circuit shown below to design a bandreject filter with a center frequency of 100 krad/s and a bandwidth of 10 Mrad/s, and a pass band gain of 10. Use 1 nF capacitors and specify all resistor values.

AC Circuits > Frequency Response > Second-Order Bandreject Filter
Keywords:
Length: 10:53    Date Added: 2007-07-27 11:22:55    Filename: ac_freq_activebrf2_ex1_eng    ID: 377
diagram_thumbnail Problem 1

Use the prototype circuits shown below to design a third-order lowpass Butterworth filter that will have a passband gain of 10 dB and a cutoff frequency of 4 kHz.

AC Circuits > Frequency Response > Third-Order Lowpass Filter
Keywords:
Length: 9:19    Date Added: 2007-07-27 13:28:04    Filename: ac_freq_activelpf3_ex1_eng    ID: 392
Category: Lowpass Filter/
diagram_thumbnail Problem 1

Find the transfer function H(jω)=Vout/Vin. What type of filter is it?

AC Circuits > Frequency Response > Lowpass Filter
Keywords:
Length: 6:12    Date Added: 2007-07-27 13:31:58    Filename: ac_freq_passivelpf_ex1_eng    ID: 393
diagram_thumbnail Problem 2

Find the transfer function H(jω)=Vout/Vin. What type of filter is it?

AC Circuits > Frequency Response > Lowpass Filter
Keywords:
Length: 5:28    Date Added: 2007-07-27 13:33:41    Filename: ac_freq_passivelpf_ex2_eng    ID: 394
diagram_thumbnail Problem 1

Find the transfer function H(s)=Vout/Vin. What type of filter is it? What is the cutoff frequency of the filter?

AC Circuits > Frequency Response > Third-Order Highpass Filter
Keywords:
Length: 0:00    Date Added: 2007-07-27 13:51:52    Filename: ac_activehpf3_ex1_eng    ID: 399
Category: Mutual Inductance/
Category: Phasor Analysis/
diagram_thumbnail Problem 1

Determine the voltage Vo.

AC Circuits > Mutual Inductance > Phasor Analysis
Keywords:
Length: 3:47    Date Added: 2007-07-26 11:01:33    Filename: ac_mutual_phasor_ex1_eng    ID: 333
diagram_thumbnail Problem 2

Determine the current I.

AC Circuits > Mutual Inductance > Phasor Analysis
Keywords:
Length: 3:34    Date Added: 2007-07-26 11:10:29    Filename: ac_mutual_phasor_ex2_eng    ID: 334
diagram_thumbnail Problem 3

Determine the voltage vO(t)

AC Circuits > Mutual Inductance > Phasor Analysis
Keywords:
Length: 6:54    Date Added: 2007-07-26 11:18:13    Filename: ac_mutual_phasor_ex3_eng    ID: 335
Category: Phasors/
diagram_thumbnail Problem 2

Find the Norton equivalent circuit at the terminals Q-R. Express all complex values in your answer in both rectangular and polar form.

AC Circuits > Phasors > Norton Equivalents
Keywords:
Length: 3:38    Date Added: 2007-07-26 11:43:37    Filename: ac_phasors_norton_ex2_eng    ID: 340
diagram_thumbnail Problem 1

Find the Norton equivalent circuit at the terminals F-G. Express all complex values in your solution in both rectangular and polar form.

AC Circuits > Phasors > Norton Equivalents
Keywords:
Length: 3:25    Date Added: 2007-07-27 10:17:26    Filename: ac_phasors_norton_ex1_eng    ID: 373
Category: Mesh Analysis/
diagram_thumbnail Problem 3

Use mesh current analysis to find the phasor voltages V1 and V2.

AC Circuits > Phasors > Mesh Analysis
Keywords:
Length: 5:23    Date Added: 2007-07-26 11:50:15    Filename: ac_phasors_mesh_ex3_eng    ID: 341
diagram_thumbnail Problem 1

Find the steady-state sinusoidal current i(t) using mesh current analysis.

AC Circuits > Phasors > Mesh Analysis
Keywords:
Length: 6:14    Date Added: 2007-07-27 09:47:18    Filename: ac_phasors_mesh_ex1_eng    ID: 366
diagram_thumbnail Problem 2

Use mesh current analysis to find the phasor current I and the phasor voltages V1 and V2.

AC Circuits > Phasors > Mesh Analysis
Keywords:
Length: 6:56    Date Added: 2007-07-27 09:56:15    Filename: ac_phasors_mesh_ex2_eng    ID: 367
diagram_thumbnail Problem 4

Find the current I using mesh current analysis.

AC Circuits > Phasors > Mesh Analysis
Keywords:
Length: 4:43    Date Added: 2007-07-27 10:06:25    Filename: ac_phasors_mesh_ex4_eng    ID: 369
diagram_thumbnail Problem 5

Find the indicated mesh currents.

AC Circuits > Phasors > Mesh Analysis
Keywords:
Length: 5:50    Date Added: 2007-07-27 10:10:25    Filename: ac_phasors_mesh_ex5_eng    ID: 372
diagram_thumbnail Problem 2

Find the voltage gain and phase shift of this circuit.

AC Circuits > Phasors > Operational Amplifiers
Keywords:
Length: 2:59    Date Added: 2007-07-26 12:59:19    Filename: ac_phasors_opamps_ex2_eng    ID: 342
diagram_thumbnail Problem 4

Suppose this circuit is driven by a sinusoidal voltage source operating at 200 Hz. Determine the gain and phase shift of the circuit.

AC Circuits > Phasors > Operational Amplifiers
Keywords:
Length: 3:54    Date Added: 2007-07-26 13:02:14    Filename: ac_phasors_opamps_ex4_eng    ID: 343
diagram_thumbnail Problem 1

Find the output voltage vo(t) using phasor analysis.

AC Circuits > Phasors > Operational Amplifiers
Keywords:
Length: 3:16    Date Added: 2007-07-27 10:07:11    Filename: ac_phasors_opamps_ex1_eng    ID: 370
diagram_thumbnail Problem 3

At what frequency (in Hz) will the magnitude of the gain be 0.707?

AC Circuits > Phasors > Operational Amplifiers
Keywords:
Length: 5:03    Date Added: 2007-07-27 14:08:46    Filename: ac_phasors_opamps_ex3_eng    ID: 404
Category: Superposition/
diagram_thumbnail Problem 2

Find the voltage v(t) using the superposition method.

AC Circuits > Phasors > Superposition
Keywords:
Length: 8:10    Date Added: 2007-07-26 13:06:14    Filename: ac_phasors_super_ex2_eng    ID: 344
diagram_thumbnail Problem 1

Find the current i(t) using the superposition method. Write it in the form IMcos(ωt+θ°).

AC Circuits > Phasors > Superposition
Keywords:
Length: 6:04    Date Added: 2007-07-27 14:12:23    Filename: ac_phasors_super_ex1_eng    ID: 405
diagram_thumbnail Problem 2

Find the Thevenin equivalent circuit at the terminals Q-R. Express all complex values in your answer in both rectangular and polar form.

AC Circuits > Phasors > Thevenin Equivalents
Keywords:
Length: 3:01    Date Added: 2007-07-26 13:11:27    Filename: ac_phasors_thev_ex2_eng    ID: 345
diagram_thumbnail Problem 1

Find the Thevenin equivalent circuit at the terminals F-G. Express all complex values in your solution in both rectangular and polar form.

AC Circuits > Phasors > Thevenin Equivalents
Keywords:
Length: 3:57    Date Added: 2007-07-27 11:09:03    Filename: ac_phasors_thev_ex1_eng    ID: 376
diagram_thumbnail Problem 1

Apply repeated source transformations to reduce this to an equivalent circuit at the terminals G-H. The simplified circuit will consist of a voltage source in series with two series-connected passive elements.

AC Circuits > Phasors > Source Transformations
Keywords:
Length: 4:24    Date Added: 2007-07-27 10:37:11    Filename: ac_phasors_srctrans_ex1_eng    ID: 374
diagram_thumbnail Problem 2

Apply repeated source transformations to reduce this to an equivalent circuit at the terminals J-K. The simplified circuit will consist of a current source in parallel with two series-connected passive elements.

AC Circuits > Phasors > Source Transformations
Keywords:
Length: 5:16    Date Added: 2007-07-27 10:55:45    Filename: ac_phasors_srctrans_ex2_eng    ID: 375
Category: Nodal Analysis/
diagram_thumbnail Problem 4

Find all of the node voltages in the circuit.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 3:01    Date Added: 2007-07-31 13:20:55    Filename: ac_phasors_nodal_ex4_eng    ID: 410
diagram_thumbnail Problem 5

Find the indicated currents expressed as cosine functions. Use the node voltage analysis method first.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 7:19    Date Added: 2007-07-31 14:29:03    Filename: ac_phasors_nodal_ex5_eng    ID: 411
diagram_thumbnail Problem 6

Use nodal analysis to determine which impedance element has the lowest voltage magnitude across its terminals.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 6:01    Date Added: 2007-07-31 15:16:16    Filename: ac_phasors_nodal_ex6_eng    ID: 412
diagram_thumbnail Problem 1

Find the steady-state sinusoidal voltages v1(t) and v2(t) using node voltage analysis.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 6:30    Date Added: 2007-08-03 14:30:09    Filename: ac_phasors_nodal_ex1_eng    ID: 450
diagram_thumbnail Problem 2

Find the steady-state sinusoidal voltages v1(t), v2(t), and v3(t) using node voltage analysis.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 7:29    Date Added: 2007-08-03 14:30:18    Filename: ac_phasors_nodal_ex2_eng    ID: 451
diagram_thumbnail Problem 3

Find the steady-state sinusoidal voltages v1(t) and v2(t) using node voltage analysis.

AC Circuits > Phasors > Nodal Analysis
Keywords:
Length: 5:15    Date Added: 2007-08-03 14:30:24    Filename: ac_phasors_nodal_ex3_eng    ID: 452
Category: Power/
Category: Apparent Power/
diagram_thumbnail Problem 1

Find the apparent power absorbed by the load in the circuit if v = 4 cos

(3000t+30°) V.

AC Circuits > Power > Apparent Power
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Length: 6:54    Date Added: 2007-07-26 13:14:53    Filename: ac_power_app_ex1_eng    ID: 346
Category: Power Factor/
diagram_thumbnail Problem 1

The load in the circuit absorbs an average power of 80 W and a reactive power of 60 VAR. What is the power factor of the load? What are the values of the resistor and the inductor if v = 110 cos (2π60t) V?

AC Circuits > Power > Power Factor
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Length: 5:15    Date Added: 2007-07-26 13:18:13    Filename: ac_power_pf_ex1_eng    ID: 347
diagram_thumbnail Problem 2

Three 220 Vrms loads are connected in parallel. Load 1 absorbs an average power of 800 W and a reactive power of 200 VAR. Load 2 absorbs an average power of 600 W at 0.6 lagging power factor. Load 3 is a 80 Ω resistor in series with a capacitive reactance of 60  Ω. What is the pf of the equivalent load as seen by the voltage source?

AC Circuits > Power > Power Factor
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Length: 6:48    Date Added: 2007-07-26 13:20:54    Filename: ac_power_pf_ex2_eng    ID: 348
diagram_thumbnail Problem 3

In the circuit, Z1=100+j60 Ω and Z2=10-j20 Ω. Calculate the pf of the equivalent

load as seen by the voltage source and the total complex power delivered by the voltage source.

AC Circuits > Power > Power Factor
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Length: 4:27    Date Added: 2007-07-26 13:23:55    Filename: ac_power_pf_ex3_eng    ID: 349
Category: RMS Value/
diagram_thumbnail Problem 1

The periodic current is applied to a 10 kΩ resistor. Find the average power consumed by the resistor.

AC Circuits > Power > RMS Value
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Length: 5:51    Date Added: 2007-07-26 13:29:46    Filename: ac_power_rms_ex1_eng    ID: 350
Category: Complex Power/
diagram_thumbnail Problem 1

Find the average power, the reactive power and the complex power delivered by the voltage source if v = 6 cos (1000t) V.

AC Circuits > Power > Complex Power
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Length: 5:24    Date Added: 2007-07-26 13:32:13    Filename: ac_power_s_ex1_eng    ID: 351
Category: Average Power/
diagram_thumbnail Problem 1

Find the average power absorbed by resistor, inductor and the capacitor in the circuit if v = 4 cos (2000t) V.

AC Circuits > Power > Average Power
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Length: 7:41    Date Added: 2007-07-27 13:55:40    Filename: ac_power_avg_ex1_eng    ID: 400
diagram_thumbnail Problem 1

Calculate the instantaneous power at the terminals of the network if v = 10 cos(2π 60t + 130°) V, i = 1 cos(2π 60t + 60°) mA

AC Circuits > Power > Instantaneous Power
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Length: 4:54    Date Added: 2007-07-27 13:59:59    Filename: ac_power_inst_ex1_eng    ID: 401
diagram_thumbnail Problem 1

In the circuit, a 110 Vrms load is fed from a transmission line having a impedance of 4 + j1 Ω. The load absorbs an average power of 8 kW at a lagging pf of 0.8.

a) Determine the apparent power required to supply the load and the average power lost in the transmission line.

b) Compute the value of a capacitor that would correct the power factor to 1 if placed in parallel with the load. Recompute the values in (a) for the load with the corrected power factor.

AC Circuits > Power > Power Factor Correction
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Length: 7:12    Date Added: 2007-07-27 14:04:30    Filename: ac_power_pfcorr_ex1_eng    ID: 402
diagram_thumbnail Problem 2

Three 100 Vrms loads are connected in parallel. Load 1 is a 50 Ω resistor in series with an inductive reactance of 40 Ω. Load 2 absorbs an average power of 500 W at 0.75 lagging power factor. Load 3 absorbs an apparent power of 600 VA at 0.9 lagging power factor. Assume the circuit is operating at 60 Hz. Compute the value of a capacitor that would correct the power factor to 1 if placed in parallel with the loads.

AC Circuits > Power > Power Factor Correction
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Length: 7:50    Date Added: 2007-07-27 14:06:48    Filename: ac_power_pfcorr_ex2_eng    ID: 403
diagram_thumbnail Problem 1

Determine the impedance ZL that results in the maximum average power transferred to ZL. What is the maximum average power transferred to the load impedance?

AC Circuits > Power > Maximum Power Tranfer
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Length: 7:37    Date Added: 2007-08-03 14:28:43    Filename: ac_power_maxtransfer_ex1_eng    ID: 441
diagram_thumbnail Problem 2

Determine settings of R and L that will result in the maximum average power transferred to R if is = 1 cos(1000t) mA and vs = 30 cos(1000t+30°) V. What is the maximum average power transferred to R?

AC Circuits > Power > Maximum Power Tranfer
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Length: 8:12    Date Added: 2007-08-03 14:28:52    Filename: ac_power_maxtransfer_ex2_eng    ID: 442
Category: Two-Port Networks/
diagram_thumbnail Problem 2

Find the z parameters of the two-ports.

AC Circuits > Two-Port Networks > Impedance Parameters
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Length: 10:46    Date Added: 2007-07-26 14:06:20    Filename: ac_twoport_z_ex2_eng    ID: 356
diagram_thumbnail Problem 1

Find the z parameters of the two-ports.

AC Circuits > Two-Port Networks > Impedance Parameters
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Length: 8:24    Date Added: 2007-08-07 12:51:46    Filename: ac_twoport_z_ex1_eng    ID: 483
Category: Power/
diagram_thumbnail Problem 1

An ideal balanced three-phase Y-connected generator with negative sequence is connected with a balanced three-phase-Wye-connected load. Calculate the total average power delivered to the Y-connected load. Calculate the total reactive power absorbed by the load.

AC Circuits > Balanced Three-Phase > Power
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Length: 4:55    Date Added: 2007-07-30 09:41:13    Filename: ac_3phase_power_ex1_eng    ID: 406
diagram_thumbnail Problem 2

A balanced three-phase-Wye-connected load requires 270 W at a lagging power factor of 0.9. The load is fed by an ideal three-phase generator through a line having an impedance of 0.5+j1 Ω. The line voltage at the terminals of the load is 200 V. Calculate the complex power delivered by the generator.

AC Circuits > Balanced Three-Phase > Power
Keywords:
Length: 7:30    Date Added: 2007-07-30 11:35:29    Filename: ac_3phase_power_ex2_eng    ID: 407
diagram_thumbnail Problem 1

A balanced three-phase Y-connected generator with positive sequence is connected with a balanced three-phase-delta-connected load. Calculate the phase voltages at the load terminals.

AC Circuits > Balanced Three-Phase > Wye-Delta Connection
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Length: 4:25    Date Added: 2007-07-30 13:42:36    Filename: ac_3phase_yd_ex1_eng    ID: 409
diagram_thumbnail Problem 1

A balanced three-phase Y-connected generator with positive sequence is connected with a balanced three-phase-connected load.

a) Calculate the three line currents IaA, IbB, and IcC.

b) Calculate the line voltages VAB, VBC, and VCA.

AC Circuits > Balanced Three-Phase > Wye-Wye Connection
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Length: 5:45    Date Added: 2007-08-03 14:29:01    Filename: ac_3phase_yy_ex1_eng    ID: 443
diagram_thumbnail Problem 2

The phase voltage at the terminals of a balanced three-phase Y-Connected load is 200 V. Assume the phase sequence is positive and the internal impedance of the source is 1+j1 Ω per phase. For each phase, the load has an impedance of 100+j100 Ω and the line impedance is 2+j2 Ω. Find the internal phase-to-neutral voltages at the source.

AC Circuits > Balanced Three-Phase > Wye-Wye Connection
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Length: 5:11    Date Added: 2007-08-03 14:29:06    Filename: ac_3phase_yy_ex2_eng    ID: 444
Category: Voltages/
diagram_thumbnail Problem 1

The magnitude of the phase voltage of an ideal balanced three-phase Y-connected source is 400 V. The source is connected to a balanced Y-connected load through a line that has an impedance of 1+j5 Ω. The load is a 19 Ω resistor in series with an inductive reactance and the magnitude of the load voltage is 380 V. If the circuit is operating at the frequency of 60 Hz, determine the inductance of the load.

AC Circuits > Balanced Three-Phase > Voltages
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Length: 5:36    Date Added: 2007-08-03 14:29:15    Filename: ac_3phase_voltage_ex1_eng    ID: 445
diagram_thumbnail Problem 1

Is the circuit a balanced three-phase system? Find I.

AC Circuits > Balanced Three-Phase > Introductory Concepts
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Length: 2:44    Date Added: 2007-08-03 14:29:21    Filename: ac_3phase_intro_ex1_eng    ID: 446
diagram_thumbnail Problem 1

Is the circuit a balanced three-phase system? Find I.

AC Circuits > Unbalanced Three-Phase > Introductory Concepts
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Length: 6:53    Date Added: 2007-07-30 12:48:25    Filename: ac_3phase_unbal_ex1_eng    ID: 408