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​ = 8 ΩIR1​+−V1​10 VR2​10 ΩAR3​4 Ω

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

V1 = 10 VR1 = 8 ΩR2 = 10 ΩR3 = 4 Ω
IR1 = A
2.Easy
R1​ = 5 Ω+−V1​8 VR2​5 ΩIR2​AR3​8 Ω

Find the current IR2 through R2.

V1 = 8 VR1 = 5 ΩR2 = 5 ΩR3 = 8 Ω
IR2 = A
3.Medium
R1​ = 5 ΩR3​ = 2 Ω+−V1​12 VR2​8 ΩAR4​3 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 12 VR1 = 5 ΩR2 = 8 ΩR3 = 2 ΩR4 = 3 Ω
Req = Ω
4.Medium
R1​ = 12 ΩIR1​R3​ = 2 Ω+−V1​30 VR2​8 ΩAR4​12 ΩB

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

V1 = 30 VR1 = 12 ΩR2 = 8 ΩR3 = 2 ΩR4 = 12 Ω
IR1 = A
5.Hard
R1​ = 3 ΩIR1​R3​ = 2 ΩR5​ = 12 Ω+−V1​15 VR2​25 ΩAR4​6 ΩBR6​3 Ω

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

V1 = 15 VR1 = 3 ΩR2 = 25 ΩR3 = 2 ΩR4 = 6 ΩR5 = 12 ΩR6 = 3 Ω
IR1 = A
6.Hard
R1​ = 5 ΩR3​ = 10 ΩR5​ = 12 Ω+−V1​9 VR2​6 ΩIR2​AR4​2 ΩBR6​3 Ω

Find the current IR2 through R2.

V1 = 9 VR1 = 5 ΩR2 = 6 ΩR3 = 10 ΩR4 = 2 ΩR5 = 12 ΩR6 = 3 Ω
IR2 = A

Answer key

  1. 1. IR1 = 0.9211 A
  2. 2. IR2 = 0.6095 A
  3. 3. Req = 8.077 Ω
  4. 4. IR1 = 1.755 A
  5. 5. IR1 = 1.87 A
  6. 6. IR2 = 0.6642 A

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