What is the S.I. unit of Energy?

Joule

The correct answer is option 1. Joule.

The joule (J) is the standard unit of energy in the International System of Units (SI). It represents the amount of work done when a force of one newton is exerted over a distance of one meter in the direction of the force. In simpler terms, it measures the amount of energy transferred or converted from one form to another.

For example:

• Lifting a one-kilogram mass by one meter against the force of gravity requires approximately 9.8 joules of energy.
• Heating one gram of water by one degree Celsius requires approximately 4.184 joules of energy.

The joule is a versatile unit used in various fields such as physics, engineering, chemistry, and everyday life to quantify energy in its different forms, including mechanical, thermal, electrical, and chemical energy.