Series & parallel resistors worksheet with answers

Free printable Series & parallel resistors 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
R1​ = 3 Ω+−V1​6 VR2​3 ΩIR2​AR3​5 Ω

Find the current IR2 through R2.

V1 = 6 VR1 = 3 ΩR2 = 3 ΩR3 = 5 Ω
IR2 = A
2.Easy
R1​ = 12 Ω+−V1​15 VR2​5 ΩAR3​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 12 ΩR2 = 5 ΩR3 = 12 Ω
Req = Ω
3.Medium
R1​ = 2 ΩIR1​R3​ = 3 Ω+−V1​24 VR2​15 ΩAR4​12 ΩB

Find the current IR1 delivered by the source, which flows through R1.

V1 = 24 VR1 = 2 ΩR2 = 15 ΩR3 = 3 ΩR4 = 12 Ω
IR1 = A
4.Medium
R1​ = 6 ΩIR1​R3​ = 6 Ω+−V1​15 VR2​6 ΩAR4​20 ΩB

Find the current IR1 delivered by the source, which flows through R1.

V1 = 15 VR1 = 6 ΩR2 = 6 ΩR3 = 6 ΩR4 = 20 Ω
IR1 = A
5.Hard
R1​ = 25 ΩR3​ = 2 ΩR5​ = 2 Ω+−V1​5 VR2​10 ΩAR4​6 ΩBR6​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 5 VR1 = 25 ΩR2 = 10 ΩR3 = 2 ΩR4 = 6 ΩR5 = 2 ΩR6 = 12 Ω
Req = Ω
6.Hard
R1​ = 6 ΩIR1​R3​ = 10 ΩR5​ = 3 Ω+−V1​5 VR2​8 ΩAR4​8 ΩBR6​3 Ω

Find the current IR1 delivered by the source, which flows through R1.

V1 = 5 VR1 = 6 ΩR2 = 8 ΩR3 = 10 ΩR4 = 8 ΩR5 = 3 ΩR6 = 3 Ω
IR1 = A

Answer key

  1. 1. IR2 = 0.7692 A
  2. 2. Req = 15.53 Ω
  3. 3. IR1 = 2.526 A
  4. 4. IR1 = 1.379 A
  5. 5. Req = 28.83 Ω
  6. 6. IR1 = 0.454 A

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