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Ohms Laws
Electrical Engineering

Ohm's Law

Ohm’s Law Equation can be used to calculate the relationship between voltage, current, and resistance:

\[\text{V}=\text{I}\times\text{R}\]

Where:

V = Voltage (volts)
I = Current (amperes)
R = Resistance (ohms)

When current passes through a resistance, power is dissipated in the form of heat. Power is calculated by the following:

\[\text{P}=\text{V}\times\text{I}\]

Where:

P = Power (watts)

These equations help provide guidance on expressing any one of the four electrical parameters in terms of any other two. A reference table of derived expressions is given below.

DC ELECTRICAL EQUATIONS
VOLTAGE CURRENT RESISTANCE
POWER
\[\text{I}\times\text{R}\]
\[\frac{\text{V}}{\text{R}}\]
\[\frac{\text{V}}{\text{I}}\]
\[\text{V}\times\text{R}\]
\[\frac{\text{P}}{\text{I}}\]
\[\frac{\text{P}}{\text{V}}\]
\[\frac{\text{V}^2}{\text{P}}\]
\[\frac{\text{V}^2\ }{\text{R}}\]
\[\sqrt{\left(\text{P}\times\text{R}\right)}\]
\[\sqrt{\left(\frac{\text{P}}{\text{R}}\right)}\]
\[\frac{\ \text{P}}{\ \text{I}^2\ }\]
\[\text{I}^2\times\text{R}\]