What is the unit of measurement for energy in the International System of Units (SI)?

The unit of measurement for energy in the International System of Units (SI) is the joule. This is defined as the amount of energy transferred or converted when a force of one newton is applied over a distance of one meter. The joule is a fundamental unit and is widely used in various fields of science and engineering, particularly in physics and chemistry, to quantify energy, work, and heat.

In contrast, the watt is a unit of power, which measures the rate of energy transfer, and is defined as one joule per second. The calorie is another unit of energy, primarily used in nutrition and heating contexts, but it is not part of the SI system. The newton is a unit of force and does not measure energy directly but is related to the concept of energy in the context of work done when a force moves an object. Thus, the joule stands out as the correct answer because it directly represents energy measurement in the SI system.