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 Ω+−V1​15 VR2​5 ΩAR3​10 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 6 ΩR2 = 5 ΩR3 = 10 Ω
Req = Ω
2.Easy
R1​ = 12 ΩIR1​+−V1​6 VR2​2 ΩAR3​2 Ω

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

V1 = 6 VR1 = 12 ΩR2 = 2 ΩR3 = 2 Ω
IR1 = A
3.Medium
R1​ = 8 ΩR3​ = 6 Ω+−V1​15 VR2​3 ΩIR2​AR4​15 ΩB

Find the current IR2 through R2.

V1 = 15 VR1 = 8 ΩR2 = 3 ΩR3 = 6 ΩR4 = 15 Ω
IR2 = A
4.Medium
R1​ = 12 ΩIR1​R3​ = 10 Ω+−V1​10 VR2​12 ΩAR4​8 ΩB

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

V1 = 10 VR1 = 12 ΩR2 = 12 ΩR3 = 10 ΩR4 = 8 Ω
IR1 = A
5.Hard
R1​ = 8 ΩIR1​R3​ = 3 ΩR5​ = 30 Ω+−V1​15 VR2​3 ΩAR4​4 ΩBR6​12 Ω

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

V1 = 15 VR1 = 8 ΩR2 = 3 ΩR3 = 3 ΩR4 = 4 ΩR5 = 30 ΩR6 = 12 Ω
IR1 = A
6.Hard
R1​ = 2 ΩIR1​R3​ = 12 ΩR5​ = 5 Ω+−V1​9 VR2​10 ΩAR4​15 ΩBR6​25 Ω

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

V1 = 9 VR1 = 2 ΩR2 = 10 ΩR3 = 12 ΩR4 = 15 ΩR5 = 5 ΩR6 = 25 Ω
IR1 = A

Answer key

  1. 1. Req = 9.333 Ω
  2. 2. IR1 = 0.4615 A
  3. 3. IR2 = 1.235 A
  4. 4. IR1 = 0.5208 A
  5. 5. IR1 = 1.49 A
  6. 6. IR1 = 1.014 A

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