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
10 V50 HzR = 20 ΩL = 250 mH

A series RL circuit is connected to a 10 V (rms), 50 Hz supply. Find the magnitude of the impedance |Z|.

V = 10 V (rms)f = 50 HzR = 20 ΩL = 250 mH
|Z| = Ω
2.Easy
24 V50 HzR = 15 ΩL = 250 mH

A series RL circuit is connected to a 24 V (rms), 50 Hz supply. Find the rms voltage VR across the resistor.

V = 24 V (rms)f = 50 HzR = 15 ΩL = 250 mH
VR = V
3.Medium
50 V60 HzR = 60 ΩL = 100 mHC = 100 µFI

A series RLC circuit is connected to a 50 V (rms), 60 Hz supply. Find the rms current I.

V = 50 V (rms)f = 60 HzR = 60 ΩL = 100 mHC = 100 µF
I = A
4.Medium
10 V200 HzR = 20 ΩL = 100 mHC = 100 µFI

A series RLC circuit is connected to a 10 V (rms), 200 Hz supply. Find the rms current I.

V = 10 V (rms)f = 200 HzR = 20 ΩL = 100 mHC = 100 µF
I = A
5.Hard
100 V500 HzR = 40 ΩL = 250 mHC = 1 µFI

A series RLC circuit is connected to a 100 V (rms), 500 Hz supply. Find the rms current I.

V = 100 V (rms)f = 500 HzR = 40 ΩL = 250 mHC = 1 µF
I = A
6.Hard
50 V200 HzR = 100 ΩL = 250 mHC = 100 µFI

A series RLC circuit is connected to a 50 V (rms), 200 Hz supply. Find the rms current I.

V = 50 V (rms)f = 200 HzR = 100 ΩL = 250 mHC = 100 µF
I = A

Answer key

  1. 1. |Z| = 81.05 Ω
  2. 2. VR = 4.502 V
  3. 3. I = 0.8192 A
  4. 4. I = 0.08376 A
  5. 5. I = 0.2133 A
  6. 6. I = 0.1552 A

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