Which of the following is the SI unit used to measure energy?

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

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 force, distance, and work: energy is the work done when a force moves an object over a distance.
4. Use the formula for work (which is a measure of energy): \(W = F \times d\), where \(W\) is work (energy), \(F\) is force in newtons, and \(d\) is distance in meters.
5. Recognize that the SI unit of energy derived from this formula is the joule, defined as one newton meter (\$1\ \text{J} = 1\ \text{N} \cdot 1\ \text{m}$).