QuickCalci Formulas

Ohm's Law — Worked Examples

Five real-world examples demonstrating the Ohm's Law formula (V=IR).

1

LED Circuit (20 mA, 100Ω)

Calculating voltage across an LED resistor

Inputs

I 0.02

R 100

Result

V 2.00

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2

Car Headlight (5A, 2.4Ω)

12V car electrical system

Inputs

I 5

R 2.4

Result

V 12.00

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3

Household Appliance (10A, 23Ω)

230V mains calculation

Inputs

I 10

R 23

Result

V 230.00

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4

Arduino Pin (0.02A, 250Ω)

Microcontroller GPIO current limiting

Inputs

I 0.02

R 250

Result

V 5.00

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5

High Resistance (1A, 100Ω)

Measuring across a 100Ω resistor

Inputs

I 1

R 100

Result

V 100.00

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