Junior Cycle- Energy

Energy

Is the ability to do work

Kinetic energy

Energy of motion

Potential energy

Energy that is stored due to an objects position.

Joules

Energy is measured in

gravitational potential energy

Is the energy stored in raised objects.

Chemical Energy

Is the energy stored in the bonds of molecules. e.g. food, fuels and batteries.

Sound Energy

The energy from a vibrating object

Nuclear Energy

Energy that is stored in the nucleus of an atom

Electrical Energy

Energy caused by the movement of electrons.

Law of Conservation of Energy

Energy is neither created nor destroyed but can be changed from one form to another.

Energy Transformation

Takes place when energy changes from one form into another form.

Renewable Energy

Sources of energy that do not run out. They are easily replenished.

Non-renewable Energy

Resources/Energy that cannot be replaced once it is used. E.g It takes 1000's of years to replace fossil fuels.

solar energy

energy from the sun

wind energy

Energy generated from the kinetic energy of moving air

hydroelectric energy

electrical energy produced by the flow of water

fossil fuels

Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.

fuel

a material that releases energy when it burns

A sankey diagram

A diagram that represents energy transfers by arrows. The width of each arrow depends on the amount of energy it represents.

Formula to calculate energy use

work = force x distance

Dissipated Energy

Energy that is converted to a non-useful form of energy.

Formula for calculating % efficiency

useful energy output (J) x 100 / Total energy Input (J)

Ways of improving energy efficiency at home..

Insulate walls and attics, use renewable energy sources, Double glazed windows and use efficient appliances.