What is the SI unit of energy?

Alberta Grade 9 Science Test: Master your knowledge with our comprehensive practice resources. Featuring engaging flashcards and detailed multiple-choice questions with explanations, get ready to succeed!

Multiple Choice

What is the SI unit of energy?

Explanation:
Energy is the capacity to do work, and in the SI system its amount is measured in joules. A joule is defined as the work done when a force of one newton moves an object one meter, so 1 J = 1 N·m. In base units, that’s 1 kg·m^2/s^2. This links energy directly to both force and distance. Watts measure power—the rate at which energy is transferred—so they’re not the unit of energy. Newtons are units of force, and meters are units of distance, again not energy. For example, lifting a 1-newton force by 1 meter uses 1 joule of energy.

Energy is the capacity to do work, and in the SI system its amount is measured in joules. A joule is defined as the work done when a force of one newton moves an object one meter, so 1 J = 1 N·m. In base units, that’s 1 kg·m^2/s^2. This links energy directly to both force and distance. Watts measure power—the rate at which energy is transferred—so they’re not the unit of energy. Newtons are units of force, and meters are units of distance, again not energy. For example, lifting a 1-newton force by 1 meter uses 1 joule of energy.

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