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​ = 12 ΩIR1​+−V1​12 VR2​10 ΩAR3​5 Ω

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

V1 = 12 VR1 = 12 ΩR2 = 10 ΩR3 = 5 Ω
IR1 = A
2.Easy
R1​ = 5 Ω+−V1​20 VR2​8 ΩAR3​2 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 20 VR1 = 5 ΩR2 = 8 ΩR3 = 2 Ω
Req = Ω
3.Medium
R1​ = 2 ΩR3​ = 10 Ω+−V1​6 VR2​4 ΩIR2​AR4​2 ΩB

Find the current IR2 through R2.

V1 = 6 VR1 = 2 ΩR2 = 4 ΩR3 = 10 ΩR4 = 2 Ω
IR2 = A
4.Medium
R1​ = 6 ΩR3​ = 10 Ω+−V1​12 VR2​20 ΩAR4​5 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 12 VR1 = 6 ΩR2 = 20 ΩR3 = 10 ΩR4 = 5 Ω
Req = Ω
5.Hard
R1​ = 15 ΩR3​ = 15 ΩR5​ = 8 Ω+−V1​9 VR2​5 ΩIR2​AR4​15 ΩBR6​30 Ω

Find the current IR2 through R2.

V1 = 9 VR1 = 15 ΩR2 = 5 ΩR3 = 15 ΩR4 = 15 ΩR5 = 8 ΩR6 = 30 Ω
IR2 = A
6.Hard
R1​ = 15 ΩR3​ = 4 ΩR5​ = 20 Ω+−V1​36 VR2​8 ΩAR4​5 ΩBR6​6 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 36 VR1 = 15 ΩR2 = 8 ΩR3 = 4 ΩR4 = 5 ΩR5 = 20 ΩR6 = 6 Ω
Req = Ω

Answer key

  1. 1. IR1 = 0.7826 A
  2. 2. Req = 6.6 Ω
  3. 3. IR2 = 0.9 A
  4. 4. Req = 14.57 Ω
  5. 5. IR2 = 0.3928 A
  6. 6. Req = 19.05 Ω

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