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​24 VR2​10 ΩAR3​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 24 VR1 = 8 ΩR2 = 10 ΩR3 = 12 Ω
Req = Ω
2.Easy
R1​ = 4 Ω+−V1​18 VR2​6 ΩIR2​AR3​5 Ω

Find the current IR2 through R2.

V1 = 18 VR1 = 4 ΩR2 = 6 ΩR3 = 5 Ω
IR2 = A
3.Medium
R1​ = 8 ΩIR1​R3​ = 3 Ω+−V1​12 VR2​4 ΩAR4​12 ΩB

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

V1 = 12 VR1 = 8 ΩR2 = 4 ΩR3 = 3 ΩR4 = 12 Ω
IR1 = A
4.Medium
R1​ = 5 ΩR3​ = 8 Ω+−V1​10 VR2​6 ΩAR4​20 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 10 VR1 = 5 ΩR2 = 6 ΩR3 = 8 ΩR4 = 20 Ω
Req = Ω
5.Hard
R1​ = 2 ΩIR1​R3​ = 5 ΩR5​ = 25 Ω+−V1​9 VR2​10 ΩAR4​5 ΩBR6​10 Ω

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

V1 = 9 VR1 = 2 ΩR2 = 10 ΩR3 = 5 ΩR4 = 5 ΩR5 = 25 ΩR6 = 10 Ω
IR1 = A
6.Hard
R1​ = 20 ΩIR1​R3​ = 30 ΩR5​ = 5 Ω+−V1​30 VR2​10 ΩAR4​20 ΩBR6​20 Ω

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

V1 = 30 VR1 = 20 ΩR2 = 10 ΩR3 = 30 ΩR4 = 20 ΩR5 = 5 ΩR6 = 20 Ω
IR1 = A

Answer key

  1. 1. Req = 13.45 Ω
  2. 2. IR2 = 1.216 A
  3. 3. IR1 = 1.075 A
  4. 4. Req = 9.941 Ω
  5. 5. IR1 = 1.316 A
  6. 6. IR1 = 1.07 A

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