Nodal analysis worksheet with answers

Free printable Nodal analysis 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 ΩR2​ = 6 ΩIR2​+−V1​12 VR3​6 ΩA+−V2​8 V

Use nodal analysis to find the current IR2 through R2 in the direction of the arrow.

V1 = 12 VV2 = 8 VR1 = 5 ΩR2 = 6 ΩR3 = 6 Ω
IR2 = A
2.Easy
R1​ = 3 ΩR2​ = 8 Ω+−V1​8 VR3​12 ΩIR3​A+−V2​12 V

Use nodal analysis to find the current IR3 through R3 in the direction of the arrow.

V1 = 8 VV2 = 12 VR1 = 3 ΩR2 = 8 ΩR3 = 12 Ω
IR3 = A
3.Medium
R1​ = 10 ΩR3​ = 2 Ω+−V1​30 VR2​8 ΩAR4​3 ΩBIs​1 A

Use nodal analysis to find the node voltage VA (measured from ground).

V1 = 30 VIs = 1 AR1 = 10 ΩR2 = 8 ΩR3 = 2 ΩR4 = 3 Ω
VA = V
4.Medium
R1​12 Ω+−V1​6 VI1​R2​20 Ω+−V2​24 VR3​6 Ω+−V3​24 VA

Three branches are connected between node A and ground, as shown. Use nodal analysis to find the current I1 in branch 1, flowing up into node A in the direction of the arrow.

V1 = 6 VR1 = 12 ΩV2 = 24 VR2 = 20 ΩV3 = 24 VR3 = 6 Ω
I1 = A
5.Hard
R1​ = 5 ΩR3​ = 15 Ω+−V1​30 VR2​8 ΩAR4​12 ΩIR4​B0.5·VA​

The diamond is a voltage-controlled current source that pushes a current of 0.5·VA (in A, with VA in V) up into node B. Use nodal analysis to find the current IR4 through R4 in the direction of the arrow.

V1 = 30 VR1 = 5 ΩR2 = 8 ΩR3 = 15 ΩR4 = 12 Ωg = 0.5 A/V
IR4 = A
6.Hard
R1​ = 10 Ω−+Vs​ = 10 V+−V1​10 VR2​2 ΩAR3​4 ΩBIs​4 A

The voltage source Vₛ between A and B has its + terminal at B, so it makes VB − VA = Vₛ. Use nodal analysis with a supernode to find the node voltage VB (measured from ground).

V1 = 10 VIs = 4 AVs = 10 VR1 = 10 ΩR2 = 2 ΩR3 = 4 Ω
VB = V

Answer key

  1. 1. IR2 = −0.1667 A
  2. 2. IR3 = 0.641 A
  3. 3. VA = 8.471 V
  4. 4. I1 = −1.083 A
  5. 5. IR4 = 13.51 A
  6. 6. VB = 12.94 V

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