#### Force on a Spring

When a force acts on a spring it is stretched or compressed, its length will changes by…

#### Kinetic Energy

In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion….

#### Specific Heat Capacity

Specific heat capacity is how much heat energy is required to raise 1 kg of…

#### Power

The quantity power is the rate at which work is done. The quicker work is…

#### Elastic Potential Energy

Stretching or squashing an object can transfer energy into its elastic potential energy store. What…

#### Charge

The size of the current is the rate of flow of charge. Electrons are negatively…

#### Resistance

Resistance is an electrical quantity that measures how a device or material reduces the electrical…

#### Resistance in Series and Parallel

Resistors in series and in parallel can change the total resistance in a circuit. What…

#### Electrical Power

The power of an appliance is the energy that is transferred per second. Electric power…

#### Density

Density is a measure of how compact the particles are in a substance. Density is defined…

#### Specific Latent Heat

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

#### Gravitational Potential Energy

Lifting an object in a gravitational field transfers energy into the objects gravitational energy store….

#### Efficiency

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

#### Energy Transformed

The potential difference between two points is the energy transferred per unit charge. An electrical…

#### Forces and Work Done

The unit for work done is the joule (J), or Newton meter (N-m). One joule is equal…

#### Transformers

A transformer is an piece of electrical apparatus which will increase or decrease the voltage in an…

#### The Motor Effect

A current-carrying wire or coil can exert a force on a permanent magnet. The force increases if the strength…