What unit is used to measure energy?

• A. Ampere
• B. Joule
• C. Newton
• D. Watt

Answer: (B)

The unit used to measure energy is the Joule. A Joule is defined as the amount of energy transferred when one newton of force is applied over a distance of one meter. It is a standard unit in the International System of Units (SI) and is used in various applications across physics and engineering.

While other units like the Ampere, Newton, and Watt are important in their own contexts, they measure different physical quantities. The Ampere relates to electric current, the Newton relates to force, and the Watt measures power, which is the rate of energy transfer or conversion. This distinction in what each unit measures highlights why the Joule is specifically recognized as the unit for energy.