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​24 VR2​4 ΩIR2​AR3​12 Ω

Find the current IR2 through R2.

V1 = 24 VR1 = 3 ΩR2 = 4 ΩR3 = 12 Ω
IR2 = A
2.Easy
R1​ = 4 Ω+−V1​20 VR2​12 ΩAR3​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 20 VR1 = 4 ΩR2 = 12 ΩR3 = 12 Ω
Req = Ω
3.Medium
R1​ = 2 ΩIR1​R3​ = 8 Ω+−V1​30 VR2​8 ΩAR4​2 ΩB

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

V1 = 30 VR1 = 2 ΩR2 = 8 ΩR3 = 8 ΩR4 = 2 Ω
IR1 = A
4.Medium
R1​ = 3 ΩIR1​R3​ = 8 Ω+−V1​12 VR2​4 ΩAR4​4 ΩB

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

V1 = 12 VR1 = 3 ΩR2 = 4 ΩR3 = 8 ΩR4 = 4 Ω
IR1 = A
5.Hard
R1​ = 30 ΩIR1​R3​ = 8 ΩR5​ = 8 Ω+−V1​9 VR2​5 ΩAR4​6 ΩBR6​5 Ω

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

V1 = 9 VR1 = 30 ΩR2 = 5 ΩR3 = 8 ΩR4 = 6 ΩR5 = 8 ΩR6 = 5 Ω
IR1 = A
6.Hard
R1​ = 6 ΩIR1​R3​ = 4 ΩR5​ = 30 Ω+−V1​24 VR2​25 ΩAR4​3 ΩBR6​20 Ω

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

V1 = 24 VR1 = 6 ΩR2 = 25 ΩR3 = 4 ΩR4 = 3 ΩR5 = 30 ΩR6 = 20 Ω
IR1 = A

Answer key

  1. 1. IR2 = 3 A
  2. 2. Req = 10 Ω
  3. 3. IR1 = 4.655 A
  4. 4. IR1 = 2 A
  5. 5. IR1 = 0.2683 A
  6. 6. IR1 = 2.112 A

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