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​ = 3 Ω+−V1​6 VR2​3 ΩIR2​AR3​8 Ω

Find the current IR2 through R2.

V1 = 6 VR1 = 3 ΩR2 = 3 ΩR3 = 8 Ω
IR2 = A
2.Easy
R1​ = 2 Ω+−V1​20 VR2​4 ΩAR3​5 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 20 VR1 = 2 ΩR2 = 4 ΩR3 = 5 Ω
Req = Ω
3.Medium
R1​ = 15 ΩIR1​R3​ = 12 Ω+−V1​12 VR2​3 ΩAR4​8 ΩB

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

V1 = 12 VR1 = 15 ΩR2 = 3 ΩR3 = 12 ΩR4 = 8 Ω
IR1 = A
4.Medium
R1​ = 10 ΩR3​ = 3 Ω+−V1​15 VR2​2 ΩAR4​20 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 15 VR1 = 10 ΩR2 = 2 ΩR3 = 3 ΩR4 = 20 Ω
Req = Ω
5.Hard
R1​ = 8 ΩIR1​R3​ = 12 ΩR5​ = 3 Ω+−V1​12 VR2​25 ΩAR4​2 ΩBR6​6 Ω

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

V1 = 12 VR1 = 8 ΩR2 = 25 ΩR3 = 12 ΩR4 = 2 ΩR5 = 3 ΩR6 = 6 Ω
IR1 = A
6.Hard
R1​ = 3 ΩIR1​R3​ = 25 ΩR5​ = 30 Ω+−V1​6 VR2​6 ΩAR4​4 ΩBR6​10 Ω

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

V1 = 6 VR1 = 3 ΩR2 = 6 ΩR3 = 25 ΩR4 = 4 ΩR5 = 30 ΩR6 = 10 Ω
IR1 = A

Answer key

  1. 1. IR2 = 0.8421 A
  2. 2. Req = 4.222 Ω
  3. 3. IR1 = 0.6815 A
  4. 4. Req = 11.84 Ω
  5. 5. IR1 = 0.7133 A
  6. 6. IR1 = 0.7537 A

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