Ohm's Law (Formulas)

Voltage

Measured in Volts
Represented by a V (Sometimes an "E" for Energy)

Current

Measured in Amperes (Amps)
Represented by the letter "I"

Resistance

Measured in Ohms
Represented by the letter "R"

Power

Measured in Watts
Represented by the letter "P"

Formula; Calculating Power using Voltage and Current

V x I

Formula; Calculating Power using Voltage and Resistance

V²/R

Formula; Calculating Power using Current and Resistance

I² x R

Formula; Calculating Current using Power and Voltage

P/V

Formula; Calculating Current using Voltage and Resistance

V/R

Formula; Calculating Resistance using Voltage and Current

V/I

Formula; Calculating Resistance using Power and Current

P/I²

Formula; Calculating Resistance using Voltage and Power

V²/P

Formula; Calculating Voltage using Current and Resistance

I x R

Formula; Calculating Voltage using Power and Current

P/I