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Ohm's Lawicon

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
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Current Calculators

top of page 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

top of page Calculate for Power (P)
P = I 2 x R
Current Resistance Power
Amps Ohms Watts
P = E x I
Voltage Current Power
VoltsAmpsWatts
P = E 2 / R
Voltage Resistance Power
VoltsOhmsWatts

Resistance Calculators

top of page Calculate for Resistance (R)
R = P / I 2
PowerCurrent Resistance
WattsAmpsOhms
R = E / I
VoltageCurrent Resistance
VoltsAmpsOhms
R = E 2 / P
VoltagePower Resistance
VoltsWattsOhms

Voltage Calculators

top of page Calculate for Voltage (E)
E = I x R
CurrentResistance Voltage
AmpsOhmsVolts
E = P / I
PowerCurrent Voltage
WattsAmpsVolts
E = Square Root of (P x R)
PowerResistance Voltage
WattsOhmsVolts
Mobile Electronics Basics:
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Glossary of Terms and Definitions
Ohm's Law
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