Energy and efficiency Flashcards
1
Q
What are the nine types of energy?
A
Electrical, light, sound, kinetic, nuclear, thermal, gravitational potential, elastical potential, chemical
2
Q
Which forms of energy are stored?
A
Chemical, gravitational and elastical
3
Q
What is the law of conservation?
A
Energy can never be created or destroyed, just transferred or dissipated
4
Q
What is efficiency?
A
How good a device is at doing its job
5
Q
What happens to wasted energy?
A
It dissipates into the surroundings
6
Q
No device can ever be…
A
100% efficient
7
Q
What form of energy is wasted energy usually?
A
Heat
8
Q
What units is the energy = power x time in?
A
kwh = kw x h
9
Q
How do you work out the cost of running an appliance?
A
Number of units = power x time
Cost = number of units x cost for 1 unit
