Ohm’s Law - GCSE Physics Definition

Ohm's Law is a basic rule in physics that helps us understand how electricity flows in a circuit. It demonstrates the relationship between current, potential difference and resistance. Ohm's Law states that the current flowing through a conductor, like a wire, is directly proportional to the voltage across it, as long as the temperature stays the same. This means if you increase the voltage, the current also increases, and if you decrease the voltage, the current decreases.

The formula for Ohm's Law is:

V=IR

Where:

• V is the voltage (or potential difference), measured in volts (V)

• I is the current, measured in amperes (A)

• R is the resistance, measured in ohms (Ω)