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​ = 10 Ω+−V1​15 VR2​4 ΩIR2​AR3​4 Ω

Find the current IR2 through R2.

V1 = 15 VR1 = 10 ΩR2 = 4 ΩR3 = 4 Ω
IR2 = A
2.Easy
R1​ = 3 ΩIR1​+−V1​8 VR2​12 ΩAR3​4 Ω

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

V1 = 8 VR1 = 3 ΩR2 = 12 ΩR3 = 4 Ω
IR1 = A
3.Medium
R1​ = 15 ΩR3​ = 15 Ω+−V1​15 VR2​2 ΩAR4​3 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 15 ΩR2 = 2 ΩR3 = 15 ΩR4 = 3 Ω
Req = Ω
4.Medium
R1​ = 6 ΩR3​ = 8 Ω+−V1​15 VR2​8 ΩIR2​AR4​20 ΩB

Find the current IR2 through R2.

V1 = 15 VR1 = 6 ΩR2 = 8 ΩR3 = 8 ΩR4 = 20 Ω
IR2 = A
5.Hard
R1​ = 25 ΩIR1​R3​ = 5 ΩR5​ = 5 Ω+−V1​9 VR2​4 ΩAR4​15 ΩBR6​2 Ω

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

V1 = 9 VR1 = 25 ΩR2 = 4 ΩR3 = 5 ΩR4 = 15 ΩR5 = 5 ΩR6 = 2 Ω
IR1 = A
6.Hard
R1​ = 30 ΩIR1​R3​ = 3 ΩR5​ = 15 Ω+−V1​5 VR2​5 ΩAR4​25 ΩBR6​12 Ω

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

V1 = 5 VR1 = 30 ΩR2 = 5 ΩR3 = 3 ΩR4 = 25 ΩR5 = 15 ΩR6 = 12 Ω
IR1 = A

Answer key

  1. 1. IR2 = 0.625 A
  2. 2. IR1 = 1.333 A
  3. 3. Req = 16.8 Ω
  4. 4. IR2 = 0.9545 A
  5. 5. IR1 = 0.3233 A
  6. 6. IR1 = 0.1479 A

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