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
12 V60 HzR = 10 ΩL = 200 mHI

A series RL circuit is connected to a 12 V (rms), 60 Hz supply. Find the rms current I.

V = 12 V (rms)f = 60 HzR = 10 ΩL = 200 mH
I = A
2.Easy
50 V50 HzR = 80 ΩL = 100 mHI

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

V = 50 V (rms)f = 50 HzR = 80 ΩL = 100 mH
I = A
3.Medium
10 V500 HzR = 50 ΩL = 200 mHC = 22 µFI

A series RLC circuit is connected to a 10 V (rms), 500 Hz supply. Find the rms current I.

V = 10 V (rms)f = 500 HzR = 50 ΩL = 200 mHC = 22 µF
I = A
4.Medium
100 V100 HzR = 30 ΩL = 20 mHC = 10 µFI

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

V = 100 V (rms)f = 100 HzR = 30 ΩL = 20 mHC = 10 µF
I = A
5.Hard
10 V60 HzR = 10 ΩL = 100 mHC = 22 µF+−VC​

A series RLC circuit is connected to a 10 V (rms), 60 Hz supply. Find the rms voltage VC across the capacitor.

V = 10 V (rms)f = 60 HzR = 10 ΩL = 100 mHC = 22 µF
VC = V
6.Hard
230 V100 HzR1​ = 50 ΩR2​ = 80 ΩC = 47 µFI

A resistor R1 is connected in series with a parallel combination of R2 and a capacitor C, across a 230 V (rms), 100 Hz supply. Find the rms current I.

V = 230 V (rms)f = 100 HzR1 = 50 ΩR2 = 80 ΩC = 47 µF
I = A

Answer key

  1. 1. I = 0.1578 A
  2. 2. I = 0.5818 A
  3. 3. I = 0.01624 A
  4. 4. I = 0.6683 A
  5. 5. VC = 14.44 V
  6. 6. I = 3.359 A

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