Half Life

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease.

Gravitational Potential Energy

Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its height above Earth.


The efficiency of a device is the proportion of input energy that is converted to useful energy.

Energy Transformed

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device.

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