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 Ω+−V1​18 VR2​2 ΩAR3​6 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 18 VR1 = 8 ΩR2 = 2 ΩR3 = 6 Ω
Req = Ω
2.Easy
R1​ = 3 ΩIR1​+−V1​15 VR2​3 ΩAR3​8 Ω

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

V1 = 15 VR1 = 3 ΩR2 = 3 ΩR3 = 8 Ω
IR1 = A
3.Medium
R1​ = 6 ΩR3​ = 2 Ω+−V1​18 VR2​20 ΩIR2​AR4​20 ΩB

Find the current IR2 through R2.

V1 = 18 VR1 = 6 ΩR2 = 20 ΩR3 = 2 ΩR4 = 20 Ω
IR2 = A
4.Medium
R1​ = 3 ΩR3​ = 2 Ω+−V1​15 VR2​20 ΩAR4​8 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 3 ΩR2 = 20 ΩR3 = 2 ΩR4 = 8 Ω
Req = Ω
5.Hard
R1​ = 6 ΩIR1​R3​ = 10 ΩR5​ = 15 Ω+−V1​6 VR2​25 ΩAR4​20 ΩBR6​5 Ω

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

V1 = 6 VR1 = 6 ΩR2 = 25 ΩR3 = 10 ΩR4 = 20 ΩR5 = 15 ΩR6 = 5 Ω
IR1 = A
6.Hard
R1​ = 3 ΩR3​ = 5 ΩR5​ = 25 Ω+−V1​10 VR2​6 ΩAR4​25 ΩBR6​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 10 VR1 = 3 ΩR2 = 6 ΩR3 = 5 ΩR4 = 25 ΩR5 = 25 ΩR6 = 12 Ω
Req = Ω

Answer key

  1. 1. Req = 9.5 Ω
  2. 2. IR1 = 2.895 A
  3. 3. IR2 = 0.5723 A
  4. 4. Req = 9.667 Ω
  5. 5. IR1 = 0.3506 A
  6. 6. Req = 7.611 Ω

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