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​ = 10 Ω+−V1​15 VR2​2 ΩAR3​3 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 10 ΩR2 = 2 ΩR3 = 3 Ω
Req = Ω
2.Easy
R1​ = 2 Ω+−V1​24 VR2​10 ΩIR2​AR3​3 Ω

Find the current IR2 through R2.

V1 = 24 VR1 = 2 ΩR2 = 10 ΩR3 = 3 Ω
IR2 = A
3.Medium
R1​ = 2 ΩIR1​R3​ = 5 Ω+−V1​10 VR2​8 ΩAR4​4 ΩB

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

V1 = 10 VR1 = 2 ΩR2 = 8 ΩR3 = 5 ΩR4 = 4 Ω
IR1 = A
4.Medium
R1​ = 4 ΩIR1​R3​ = 20 Ω+−V1​15 VR2​15 ΩAR4​15 ΩB

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

V1 = 15 VR1 = 4 ΩR2 = 15 ΩR3 = 20 ΩR4 = 15 Ω
IR1 = A
5.Hard
R1​ = 8 ΩR3​ = 25 ΩR5​ = 4 Ω+−V1​12 VR2​2 ΩIR2​AR4​12 ΩBR6​30 Ω

Find the current IR2 through R2.

V1 = 12 VR1 = 8 ΩR2 = 2 ΩR3 = 25 ΩR4 = 12 ΩR5 = 4 ΩR6 = 30 Ω
IR2 = A
6.Hard
R1​ = 30 ΩIR1​R3​ = 10 ΩR5​ = 2 Ω+−V1​24 VR2​10 ΩAR4​25 ΩBR6​20 Ω

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

V1 = 24 VR1 = 30 ΩR2 = 10 ΩR3 = 10 ΩR4 = 25 ΩR5 = 2 ΩR6 = 20 Ω
IR1 = A

Answer key

  1. 1. Req = 11.2 Ω
  2. 2. IR2 = 1.286 A
  3. 3. IR1 = 1.604 A
  4. 4. IR1 = 1.034 A
  5. 5. IR2 = 1.146 A
  6. 6. IR1 = 0.6514 A

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