Which of the following is the SI unit of energy?

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

Answer: (C)

Verified step by step guidance

1. Understand that energy is a physical quantity that measures 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 of energy by considering the unit derived from the base SI units: energy is defined as work done, which is force times distance.
4. Use the formula for work or energy: \(W = F \times d\), where \(F\) is force in newtons (N) and \(d\) is distance in meters (m).
5. Recognize that the SI unit of energy is the joule (J), which is equivalent to one newton meter (\$1\,J = 1\,N \cdot m$).