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​ = 2 ΩIR1​+−V1​10 VR2​8 ΩAR3​5 Ω

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

V1 = 10 VR1 = 2 ΩR2 = 8 ΩR3 = 5 Ω
IR1 = A
2.Easy
R1​ = 8 Ω+−V1​10 VR2​5 ΩAR3​3 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 10 VR1 = 8 ΩR2 = 5 ΩR3 = 3 Ω
Req = Ω
3.Medium
R1​ = 15 ΩR3​ = 20 Ω+−V1​24 VR2​15 ΩIR2​AR4​2 ΩB

Find the current IR2 through R2.

V1 = 24 VR1 = 15 ΩR2 = 15 ΩR3 = 20 ΩR4 = 2 Ω
IR2 = A
4.Medium
R1​ = 8 ΩR3​ = 10 Ω+−V1​10 VR2​20 ΩAR4​10 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 10 VR1 = 8 ΩR2 = 20 ΩR3 = 10 ΩR4 = 10 Ω
Req = Ω
5.Hard
R1​ = 12 ΩR3​ = 30 ΩR5​ = 25 Ω+−V1​15 VR2​30 ΩIR2​AR4​25 ΩBR6​4 Ω

Find the current IR2 through R2.

V1 = 15 VR1 = 12 ΩR2 = 30 ΩR3 = 30 ΩR4 = 25 ΩR5 = 25 ΩR6 = 4 Ω
IR2 = A
6.Hard
R1​ = 20 ΩIR1​R3​ = 4 ΩR5​ = 5 Ω+−V1​24 VR2​25 ΩAR4​30 ΩBR6​30 Ω

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

V1 = 24 VR1 = 20 ΩR2 = 25 ΩR3 = 4 ΩR4 = 30 ΩR5 = 5 ΩR6 = 30 Ω
IR1 = A

Answer key

  1. 1. IR1 = 1.97 A
  2. 2. Req = 9.875 Ω
  3. 3. IR2 = 0.5966 A
  4. 4. Req = 18 Ω
  5. 5. IR2 = 0.2983 A
  6. 6. IR1 = 0.7703 A

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