Which of the following is the standard SI unit for measuring energy?

• A. Joule (J)
• B. Watt (W)
• C. Calorie (cal)
• D. Newton (N)

Answer: (A)

Verified step by step guidance

1. Understand that energy is a physical quantity that represents the capacity to do work or produce heat.
2. Recall that the International System of Units (SI) defines standard units for all physical quantities, including energy.
3. Identify the SI unit for energy by considering the relationship between energy, force, and distance. Energy is often calculated as work done, which is force times distance.
4. Recognize that the SI unit of force is the Newton (N), and distance is measured in meters (m), so energy in SI units is expressed as Newton-meter (N·m).
5. Know that the Newton-meter (N·m) is defined as a Joule (J), which is the standard SI unit for energy.