PHYSICS - Energy

Gravitational potential

energy stored in an object due to its height

Elastic

Energy stored in an object that has been stretched or compressed

Nuclear

energy stored in the nuclei

Thermal

energy stored in heat

Magnetic

energy stored in magnetic objects

Electrostatic

energy stored between 2 charged objects

chemical

energy stored in chemical bonds

Kinetic

energy stored by moving objects

Heating

energy transfer when the temperature of an object changes (increases)

Electrical

When charges flow e.g. electric kettle

Radiation

Energy is transferred in a wave e.g. light

Mechanical

Force moves an object through a distance

conservation of energy

energy cannot be made or destroyed only transferred

Useful energy

energy transferred to the place where it is wanted and in the from that it is needed

wasted energy

the energy that is not useful for the intended purpose and is dissipated to the surroundings

sankey diagrams

energy input = left

useful energy = right

wasted energy = bottom

effeciency

E = Useful energy output

total energy input

effciency limits

no machines are 100% efficient always lose in heat, light or sound

Improve efficency

Friction - lubricant

Resistance of wires means it heats = wrap them to keep heat in and therefore cool down

air resistance - streamline shape

sound energy - reduce friction