Thévenin & Norton worksheet with answers

Free printable Thévenin & Norton 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​ = 5 Ω+−V1​15 VR2​6 ΩAab

Find the Thévenin resistance Rth seen from terminals a–b.

V1 = 15 VR1 = 5 ΩR2 = 6 Ω
Rth = Ω
2.Easy
R1​ = 10 Ω+−V1​18 VR2​12 ΩAab

Find the Norton current IN: the current that flows from a to b if the terminals are shorted.

V1 = 18 VR1 = 10 ΩR2 = 12 Ω
IN = A
3.Medium
R1​ = 6 ΩR3​ = 5 Ω+−V1​6 VR2​10 ΩAab

Find the Thévenin voltage Vth seen from terminals a–b.

V1 = 6 VR1 = 6 ΩR2 = 10 ΩR3 = 5 Ω
Vth = V
4.Medium
R1​ = 2 ΩR3​ = 20 Ω+−V1​6 VR2​8 ΩARL​3 ΩIL​B

A load RL = 3 Ω is connected across a–b. Replace the rest of the circuit with its Thévenin equivalent and find the load current IL.

V1 = 6 VR1 = 2 ΩR2 = 8 ΩR3 = 20 ΩRL = 3 Ω
IL = A
5.Hard
R1​ = 10 ΩR3​ = 4 Ω+−V1​5 VR2​4 ΩAIs​1 ABRL​25 ΩIL​

A load RL = 25 Ω is connected across a–b. Use a Thévenin equivalent to find the power PL delivered to the load.

V1 = 5 VIs = 1 AR1 = 10 ΩR2 = 4 ΩR3 = 4 ΩRL = 25 Ω
PL = W
6.Hard
R1​ = 30 ΩR3​ = 20 Ω+−V1​9 VR2​10 ΩAIs​2.5 ABRL​10 ΩIL​

A load RL = 10 Ω is connected across a–b. Replace the rest of the circuit with its Thévenin equivalent and find the load current IL.

V1 = 9 VIs = 2.5 AR1 = 30 ΩR2 = 10 ΩR3 = 20 ΩRL = 10 Ω
IL = A

Answer key

  1. 1. Rth = 2.727 Ω
  2. 2. IN = 1.8 A
  3. 3. Vth = 3.75 V
  4. 4. IL = 0.1951 A
  5. 5. PL = 0.7259 W
  6. 6. IL = 1.893 A

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