Rainbow Mind Map
Energy
Learn the definition, units, forms, transformations and conservation of energy, then test yourself with an interactive seven-question quiz.
Energy Mind Map
Energy is present everywhere. It helps objects move, lights glow, sounds travel, machines work and living organisms perform daily activities.
Definition
Energy is the ability to do work.
Work–Energy Link
Work transfers energy, and energy makes work possible.
Units
SI unit: joule (J). Another common unit: calorie (cal).
Conversion
1 calorie is approximately equal to 4.2 joules.
Common Forms of Energy
Energy appears in different forms. One form can change into another depending on the system or activity.
Kinetic
Energy possessed by an object because of its motion.
Potential
Stored energy due to an object's position or condition.
Chemical
Energy stored in chemical substances, food and fuels.
Muscular
Energy used by muscles to produce movement.
Electrical
Energy associated with moving electric charges.
Magnetic
Energy stored in a magnetic field.
Heat
Thermal energy related to the motion of particles.
Light
Energy carried by electromagnetic waves.
Sound
Energy carried by vibrations through a medium.
Mechanical
The total of kinetic energy and potential energy.
Energy Transformation in a Roller Coaster
The coaster gains gravitational potential energy while climbing. During the descent, that stored energy changes mainly into kinetic energy.
Law of Conservation of Energy
Energy can neither be created nor destroyed. It can only be transferred from one object to another or transformed from one form into another.
Interactive Energy Quiz
Select one option for each question and press “Check Answer.” Your score updates automatically.
Quiz progress
1. Energy is the ability to:
2. How are work and energy related?
3. What is the SI unit of energy?
4. One calorie is approximately equal to how many joules?
5. Kinetic energy is due to _____, whereas potential energy is due to _____.
6. When a roller coaster moves down a hill, potential energy mainly changes into:
7. “Energy can neither be created nor destroyed” refers to:
