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ElecToolsHQ

Voltage Calculator

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

Formula

V = I × R

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

What this calculator does

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

Use cases

  • Find the voltage drop across a known resistance at a given current
  • Check the expected supply voltage for a load's rated current and resistance
  • Verify a calculation before applying power to a circuit

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