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The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity.


Resistance is an electrical quantity that measures how a device or material reduces the electrical current flow through it.

Electrical Power

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical energy is transferred by an electric circuit.


Density is a measure of how compact the particles are in a substance. Density is defined as the mass per unit volume.

Specific Latent Heat

Specific latent heat is the energy needed to change the state of a substance.

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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