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​ = 6 ΩIR1​+−V1​6 VR2​5 ΩAR3​6 Ω

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

V1 = 6 VR1 = 6 ΩR2 = 5 ΩR3 = 6 Ω
IR1 = A
2.Easy
R1​ = 6 Ω+−V1​10 VR2​4 ΩIR2​AR3​3 Ω

Find the current IR2 through R2.

V1 = 10 VR1 = 6 ΩR2 = 4 ΩR3 = 3 Ω
IR2 = A
3.Medium
R1​ = 20 ΩR3​ = 4 Ω+−V1​18 VR2​10 ΩAR4​12 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 18 VR1 = 20 ΩR2 = 10 ΩR3 = 4 ΩR4 = 12 Ω
Req = Ω
4.Medium
R1​ = 6 ΩIR1​R3​ = 6 Ω+−V1​12 VR2​2 ΩAR4​10 ΩB

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

V1 = 12 VR1 = 6 ΩR2 = 2 ΩR3 = 6 ΩR4 = 10 Ω
IR1 = A
5.Hard
R1​ = 5 ΩIR1​R3​ = 5 ΩR5​ = 4 Ω+−V1​6 VR2​10 ΩAR4​8 ΩBR6​15 Ω

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

V1 = 6 VR1 = 5 ΩR2 = 10 ΩR3 = 5 ΩR4 = 8 ΩR5 = 4 ΩR6 = 15 Ω
IR1 = A
6.Hard
R1​ = 6 ΩR3​ = 6 ΩR5​ = 10 Ω+−V1​5 VR2​3 ΩAR4​20 ΩBR6​3 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 5 VR1 = 6 ΩR2 = 3 ΩR3 = 6 ΩR4 = 20 ΩR5 = 10 ΩR6 = 3 Ω
Req = Ω

Answer key

  1. 1. IR1 = 0.6875 A
  2. 2. IR2 = 0.5556 A
  3. 3. Req = 26.15 Ω
  4. 4. IR1 = 1.543 A
  5. 5. IR1 = 0.591 A
  6. 6. Req = 8.467 Ω

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