Which of the following is the SI unit of energy?

• A. watt
• B. newton
• C. joule
• D. calorie

Answer: (C)

Verified step by step guidance

1. Understand that energy is the capacity to do work or produce heat, and it is measured in specific units in the International System of Units (SI).
2. Recall that the SI unit of energy is defined based on the work done when a force of one newton moves an object one meter in the direction of the force.
3. Recognize that the unit of work or energy in SI units is called the joule (J), where 1 joule = 1 newton × 1 meter.
4. Differentiate between the options: watt is a unit of power (energy per unit time), newton is a unit of force, calorie is a unit of energy but not an SI unit.
5. Conclude that the correct SI unit of energy among the given options is the joule.