Energy is defined as the ability of a system to do work or produce a change or effect, and is measured in joules. Energy can be transported, transformed, transferred, preserved, degraded, and stored, with key characteristics including its ability to change forms and move between systems.

1. DEFINITION OF ENERGY
The ability of a
system to do work.
A physical quantity
which produces a change
or effect.
ENERGY
Unit of measurement:
the joule (J).

2. Characteristics of energy
Energy can be transported. Energy can be transformed.
Energy can be transferred. Energy can be preserved. Energy can be degraded.
Energy can be stored.