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​15 VR2​12 ΩAR3​6 Ω

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

V1 = 15 VR1 = 12 ΩR2 = 12 ΩR3 = 6 Ω
IR1 = A
2.Easy
R1​ = 4 Ω+−V1​20 VR2​2 ΩIR2​AR3​8 Ω

Find the current IR2 through R2.

V1 = 20 VR1 = 4 ΩR2 = 2 ΩR3 = 8 Ω
IR2 = A
3.Medium
R1​ = 6 ΩR3​ = 15 Ω+−V1​9 VR2​6 ΩAR4​5 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 9 VR1 = 6 ΩR2 = 6 ΩR3 = 15 ΩR4 = 5 Ω
Req = Ω
4.Medium
R1​ = 4 ΩR3​ = 15 Ω+−V1​24 VR2​8 ΩAR4​8 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 24 VR1 = 4 ΩR2 = 8 ΩR3 = 15 ΩR4 = 8 Ω
Req = Ω
5.Hard
R1​ = 20 ΩR3​ = 10 ΩR5​ = 8 Ω+−V1​5 VR2​30 ΩAR4​6 ΩBR6​6 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 5 VR1 = 20 ΩR2 = 30 ΩR3 = 10 ΩR4 = 6 ΩR5 = 8 ΩR6 = 6 Ω
Req = Ω
6.Hard
R1​ = 30 ΩR3​ = 4 ΩR5​ = 6 Ω+−V1​30 VR2​4 ΩAR4​6 ΩBR6​4 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 30 VR1 = 30 ΩR2 = 4 ΩR3 = 4 ΩR4 = 6 ΩR5 = 6 ΩR6 = 4 Ω
Req = Ω

Answer key

  1. 1. IR1 = 0.9375 A
  2. 2. IR2 = 2.857 A
  3. 3. Req = 10.62 Ω
  4. 4. Req = 9.935 Ω
  5. 5. Req = 29.64 Ω
  6. 6. Req = 32.64 Ω

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