Energy part two

Principle of conservation of energy

Energy can be changed from one form to another belt the total amount of energy doesn't change

Efficiency

Efficiency = useful energy output - total energy input

Efficiency

Efficiency = \frac{Useful\,Output}{Total\,Input} \times 100\%

Non-renewable energy definition

Used faster than it can be replaced by nature. Has a finite supply & will run out sometime

Renewable energy definition

Replaced by nature in less than a human lifetime. Will never run out

Renewable energy examples

Solar, tidal, wind, geothermal, hydroelectric, biomass, waves,

Non-renewable energy examples

Coal, oil, gas, uranium, nuclear

Work done definition

Work is done on something when energy is transferred onto it

Work measurements

Nm-joules

Work done equation

Work done =size of force x distance moved in the direction of force

Power definition

The amount of work done in one second

Power equation

Power = work- time

GPE definition

The energy something has due to its position above the ground

GPE equation

Gpe=mass x grams x height above ground

Kinetic energy definition

The energy an object has due to its motion

Kinetic energy equation

Ke= ½ x mass x volume 2