Which unit is used to measure the potential difference across two points in a circuit?

• A. Amperes
• B. Ohms
• C. Volts
• D. Coulombs

Answer: (C)

The unit used to measure the potential difference across two points in an electrical circuit is volts. This measurement reflects the amount of electrical energy available to move charges between two points and is critical for understanding how electrical circuits operate. When a voltage is applied across a conductor, it creates an electric field that drives the flow of electric charge, which is measured in amperes.

Volts are essential for determining how much energy per charge is provided by a power source, allowing electrical devices to function by converting electrical energy into other forms, such as light, heat, or mechanical work. Understanding volts is foundational for anyone involved in electrical work, as it helps in calculating how components in a circuit will respond to the applied electrical force, making it invaluable knowledge in both construction and maintenance of electrical systems.