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ElecToolsHQ

Current Calculator

Calculate current from voltage and resistance using Ohm's Law (I = V ÷ R).

Formula

I = V ÷ R

I
Current, in amps
V
Voltage, in volts
R
Resistance, in ohms

What this calculator does

Solves for current given voltage and resistance, using Ohm's Law.

Use cases

  • Check a circuit's expected current draw before energizing it
  • Size a conductor or breaker based on expected current
  • Verify a multimeter reading against the expected calculation

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