In Class 10 Physics (Electricity), understanding how electricity actually flows through a wire requires understanding Electric Potential Difference (commonly known as Voltage).
Definition: The work done to move a unit charge between two points.
Formula: V = W / Q.
SI Unit: Volt (V).
Measuring Instrument: Voltmeter.
Imagine water in a pipe; it only flows if there is a difference in pressure between the two ends. Similarly, electrons in a wire only move if there is an 'electric pressure difference' pushing them. This pressure difference, created by a battery or a cell, is called the Potential Difference.
Scientific Definition: It is defined as the amount of Work Done (W) required to move a unit positive Charge (Q) from one point to another in an electric circuit.
The formula directly matches the definition:
V = W / Q
Where:
The formula for electric potential difference (Voltage) is V = W / Q, where V is potential difference, W is the work done in Joules, and Q is the charge in Coulombs.
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