Half Life
The radioactivity of a sample decreases over time. Half life is a measurement of this decrease.
gcse-physics-aqa-paper-1-solution
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.
Efficiency
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.
