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Solve Ohm's Law Homework

Check circuit problems by entering any two known values.

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V
A
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W
Enter any two values and the other two are solved automatically

πŸ’‘ Ohm's law: V = I Γ— R. Power adds P = V Γ— I. Knowing any two lets you derive the rest β€” handy for sizing resistors, checking LED current, or working out heat dissipation.

Students tips

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The core relationships are V = I Γ— R and P = V Γ— I β€” every other formula is derived from these two.

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Enter the two values your problem gives you and verify your hand calculation against the result.

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Watch your units: volts, amps (not milliamps), and ohms. Convert mA to A by dividing by 1000.

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