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Year 8Term 2 2023 Science - Energy - Coggle Diagram
Year 8Term 2 2023 Science - Energy
Efficiency
(useful energy/output energy) x 100
A measure of how well energy has been used
Represented as %
Energy
Kinetic energy
Sound energy
Movement of sound waves
Heat energy
Useless form of energy that emits heat
Electric energy
All electricity
Thermal energy
Form of heat that is useful
Calculating KE = 1/2mv squared where m = mass (kg) and v = velocity (m/s)
Potential energy
Gravitational
Stored away is transferred to moving energy on a falling object
Parachuter before they jump off the plane
Calculating GPE = mgh, m = mass, g = acceleration (9.8m/s), h = heigh (m)
Chemical
A battery's chemical energy is converted to electrical energy when it is in a circuit
Elastic
Energy stored in a stretched band and transformed to kinetic energy
Bowstring
Useful Energy
The 'loss' of useful energy
Every electrical appliance converts electrical energy into other forms of energy
Most of that energy is usually converted into useful energy - some of these can be converted into other forms that aren't useful
Energy Transformation and Transfer
Energy transfer is the movement for energy from one location to another
Energy transformation is when energy changes from one type to another (the total energy always remain the same)
Heat energy is always produced as a by-product of energy transfers