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​ = 4 Ω+−V1​24 VR2​12 ΩAR3​2 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 24 VR1 = 4 ΩR2 = 12 ΩR3 = 2 Ω
Req = Ω
2.Easy
R1​ = 4 Ω+−V1​20 VR2​5 ΩIR2​AR3​4 Ω

Find the current IR2 through R2.

V1 = 20 VR1 = 4 ΩR2 = 5 ΩR3 = 4 Ω
IR2 = A
3.Medium
R1​ = 3 ΩIR1​R3​ = 8 Ω+−V1​10 VR2​2 ΩAR4​20 ΩB

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

V1 = 10 VR1 = 3 ΩR2 = 2 ΩR3 = 8 ΩR4 = 20 Ω
IR1 = A
4.Medium
R1​ = 6 ΩIR1​R3​ = 3 Ω+−V1​15 VR2​20 ΩAR4​5 ΩB

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

V1 = 15 VR1 = 6 ΩR2 = 20 ΩR3 = 3 ΩR4 = 5 Ω
IR1 = A
5.Hard
R1​ = 4 ΩIR1​R3​ = 25 ΩR5​ = 4 Ω+−V1​30 VR2​25 ΩAR4​4 ΩBR6​2 Ω

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

V1 = 30 VR1 = 4 ΩR2 = 25 ΩR3 = 25 ΩR4 = 4 ΩR5 = 4 ΩR6 = 2 Ω
IR1 = A
6.Hard
R1​ = 15 ΩR3​ = 30 ΩR5​ = 12 Ω+−V1​18 VR2​3 ΩAR4​12 ΩBR6​6 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 18 VR1 = 15 ΩR2 = 3 ΩR3 = 30 ΩR4 = 12 ΩR5 = 12 ΩR6 = 6 Ω
Req = Ω

Answer key

  1. 1. Req = 5.714 Ω
  2. 2. IR2 = 1.429 A
  3. 3. IR1 = 2.055 A
  4. 4. IR1 = 1.28 A
  5. 5. IR1 = 1.757 A
  6. 6. Req = 17.78 Ω

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