       # Ohm's Law Calculators and Formulas

Before clicking in each Ohm's Law calculator for the answer, enter numbers into the equation you wish to use to calculate for Current, Power, Resistance, or Voltage. *Updated January 8, 2011 to accept/change commas to periods for those that use commas as decimal separators.

## Ohm's Law Calculators

Current (I) Calculators
Power (P) Calculators
Resistance (R) Calculators
Voltage (E) Calculators

## Current Calculators Calculate for Current (I) I = P / E
 Power Voltage Current Watts Volts Amps
 I = Square Root of (P / R)
 Power Resistance Current Watts Ohms Amps
 I = E / R
 Voltage Resistance Current Volts Ohms Amps

## Power Calculators Calculate for Power (P) P = I 2 x R
 Current Resistance Power Amps Ohms Watts
 P = E x I
 Voltage Current Power Volts Amps Watts
 P = E 2 / R
 Voltage Resistance Power Volts Ohms Watts

## Resistance Calculators Calculate for Resistance (R) R = P / I 2
 Power Current Resistance Watts Amps Ohms
 R = E / I
 Voltage Current Resistance Volts Amps Ohms
 R = E 2 / P
 Voltage Power Resistance Volts Watts Ohms

## Voltage Calculators Calculate for Voltage (E) E = I x R
 Current Resistance Voltage Amps Ohms Volts
 E = P / I
 Power Current Voltage Watts Amps Volts
 E = Square Root of (P x R)
 Power Resistance Voltage Watts Ohms Volts
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