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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
R1​ = 4 ΩIR1​+−V1​20 VR2​4 ΩAR3​5 Ω

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

V1 = 20 VR1 = 4 ΩR2 = 4 ΩR3 = 5 Ω
IR1 = A
2.Easy
R1​ = 2 Ω+−V1​12 VR2​5 ΩIR2​AR3​5 Ω

Find the current IR2 through R2.

V1 = 12 VR1 = 2 ΩR2 = 5 ΩR3 = 5 Ω
IR2 = A
3.Medium
R1​ = 15 ΩR3​ = 8 Ω+−V1​9 VR2​20 ΩAR4​3 ΩB

Find the equivalent resistance Req seen by the source V1.

V1 = 9 VR1 = 15 ΩR2 = 20 ΩR3 = 8 ΩR4 = 3 Ω
Req = Ω
4.Medium
R1​ = 12 ΩR3​ = 8 Ω+−V1​10 VR2​3 ΩIR2​AR4​3 ΩB

Find the current IR2 through R2.

V1 = 10 VR1 = 12 ΩR2 = 3 ΩR3 = 8 ΩR4 = 3 Ω
IR2 = A
5.Hard
R1​ = 25 ΩR3​ = 25 ΩR5​ = 10 Ω+−V1​18 VR2​10 ΩIR2​AR4​12 ΩBR6​5 Ω

Find the current IR2 through R2.

V1 = 18 VR1 = 25 ΩR2 = 10 ΩR3 = 25 ΩR4 = 12 ΩR5 = 10 ΩR6 = 5 Ω
IR2 = A
6.Hard
R1​ = 10 ΩR3​ = 6 ΩR5​ = 20 Ω+−V1​5 VR2​12 ΩAR4​20 ΩBR6​12 Ω

Find the equivalent resistance Req seen by the source V1.

V1 = 5 VR1 = 10 ΩR2 = 12 ΩR3 = 6 ΩR4 = 20 ΩR5 = 20 ΩR6 = 12 Ω
Req = Ω

Answer key

  1. 1. IR1 = 3.214 A
  2. 2. IR2 = 1.333 A
  3. 3. Req = 22.1 Ω
  4. 4. IR2 = 0.5473 A
  5. 5. IR2 = 0.4196 A
  6. 6. Req = 17.25 Ω

Full step-by-step solutions: practise this topic on examproblems.com.