AC impedance & phasors worksheet with answers

Free printable AC impedance & phasors worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
100 V60 HzR = 15 ΩL = 150 mHI

A series RL circuit is connected to a 100 V (rms), 60 Hz supply. Find the rms current I.

V = 100 V (rms)f = 60 HzR = 15 ΩL = 150 mH
I = A
2.Easy
10 V50 HzR = 30 ΩL = 20 mHI

A series RL circuit is connected to a 10 V (rms), 50 Hz supply. Find the rms current I.

V = 10 V (rms)f = 50 HzR = 30 ΩL = 20 mH
I = A
3.Medium
120 V200 HzR = 80 ΩL = 250 mHC = 2.2 µFI

A series RLC circuit is connected to a 120 V (rms), 200 Hz supply. Find the real power P taken from the supply.

V = 120 V (rms)f = 200 HzR = 80 ΩL = 250 mHC = 2.2 µF
P = W
4.Medium
120 V60 HzR = 80 ΩL = 50 mHC = 22 µFI

A series RLC circuit is connected to a 120 V (rms), 60 Hz supply. Find the rms current I.

V = 120 V (rms)f = 60 HzR = 80 ΩL = 50 mHC = 22 µF
I = A
5.Hard
24 V100 HzR = 50 ΩL = 150 mHC = 100 µF+−VC​

A series RLC circuit is connected to a 24 V (rms), 100 Hz supply. Find the rms voltage VC across the capacitor.

V = 24 V (rms)f = 100 HzR = 50 ΩL = 150 mHC = 100 µF
VC = V
6.Hard
VfR = 50 ΩL = 50 mHC = 0.047 µF

A series RLC circuit has R = 50 Ω, L = 50 mH and C = 0.047 µF. Find its bandwidth B (the width of the band between the half-power frequencies), in Hz.

R = 50 ΩL = 50 mHC = 0.047 µF
B = Hz

Answer key

  1. 1. I = 1.709 A
  2. 2. I = 0.3263 A
  3. 3. P = 133 W
  4. 4. I = 0.9273 A
  5. 5. VC = 4.11 V
  6. 6. B = 159.2 Hz

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