Op-amp circuits worksheet with answers

Free printable Op-amp circuits 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

A sensor behaves like a 1.5 V source with an internal resistance R_s = 2.2 kΩ. It feeds a load R_L = 0.47 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current I_L supplied by the op-amp output.

V_s = 1.5 VR_s = 2.2 kΩR_L = 0.47 kΩ

I_L = mA

2.Easy

A sensor behaves like a 1 V source with an internal resistance R_s = 2.2 kΩ. It feeds a load R_L = 1 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current I_L supplied by the op-amp output.

V_s = 1 VR_s = 2.2 kΩR_L = 1 kΩ

I_L = mA

3.Medium

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R₃ = R₁ and R₄ = R₂. Find the output voltage V_out.

V₁ = 0.2 VV₂ = 2.7 VR₁ = R₃ = 22 kΩR₂ = R₄ = 100 kΩ

V_out = V

4.Medium

The op-amp is ideal and runs from ±15 V supplies. Find the output voltage V_out.

V_in = 1 VR_a = 22 kΩR_b = 4.7 kΩR₁ = 2 kΩR_f = 100 kΩ

V_out = V

5.Hard

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the output voltage V_out.

V₁ = −1.4 VV₂ = 0.3 VR₁ = 47 kΩR₂ = 100 kΩR_f = 100 kΩ

V_out = V

6.Hard

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage V_out.

V₁ = 1.3 VV₂ = 0.4 VR₁ = 4.7 kΩR₂ = 22 kΩR₃ = 100 kΩR₄ = 2 kΩ

V_out = V

Answer key

1. I_L = 3.191 mA
2. I_L = 1 mA
3. V_out = 11.36 V
4. V_out = 8.978 V
5. V_out = 2.679 V
6. V_out = −6.041 V

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