Ohm’s Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the conductor and inversely proportional to the resistance (R) of the conductor, provided the temperature remains constant.
At a constant temperature, the electrical current flowing through a fixed linear resistance is directly proportional to the voltage applied across it, and also inversely proportional to the resistance.
Voltage is proportional to current, hence
\(\begin{array}{l}V\propto I\end{array} \)
\(\begin{array}{l}V=IR\end{array} \)
Where:
- V = Voltage across the conductor (in volts, V)
- I = Current flowing through the conductor (in amperes, A)
- R = Resistance of the conductor (in ohms, Ω)
Other Forms of Ohm’s Law
\(\begin{array}{l}I=\frac{V}{R}\end{array} \)
\(\begin{array}{l}R=\frac{V}{I}\end{array} \)
\begin{equation}R = \frac{\rho l}{A}\end{equation}