Which instrument is used to measure the potential difference? Also, mention the unit of potential difference.

The instrument for measuring potential difference is called a voltmeter. This device is specifically designed to measure the electric potential difference between two points in an electric circuit, providing accurate readings that are crucial for understanding electrical systems.

Definition of Potential Difference

The potential difference between two points is defined as the amount of work done to move a charge of 1 coulomb from one point to another. When 1 joule of work is done to transfer 1 coulomb of charge, the potential difference is said to be 1 volt.

Unit of Potential Difference

The S.I. unit of potential difference is joule per coulomb, commonly referred to as the volt (V). This unit honors the Italian scientist Alessandro Volta, who made significant contributions to the field of electricity.

Formula for Potential Difference

The potential difference (V) can be calculated using the formula:

V = W / q

• Where W represents the work done (in joules),
• And q represents the charge (in coulombs).

Units Explained

The units of potential difference can be broken down as follows:

Unit of potential difference = Unit of work / Unit of charge

Therefore:

1 V = 1 J / 1 C