Energy Transfers and Efficiency - Physics

?
  • Created by: becky.65
  • Created on: 30-12-15 11:30
List 8 different forms of energy
Light, sound, kinetic, electrical, gravitational potential, elastic potential, chemical and nuclear
1 of 14
What does the principle of conservation of energy state?
That energy cannot be created or destroyed, it is only possible to change it from one form to another, or transfer it from one place to another
2 of 14
Does the total amount of energy ever change?
No it always stays the same
3 of 14
What two types of energy we get out of a machine consist of?
Useful energy and wasted enegry
4 of 14
What is useful energy?
Energy which is transferred to the place we want and in the form we want it in
5 of 14
What is wasted energy?
Energy which is not usefully transferred
6 of 14
What eventually happens to both useful and wasted energy?
They will eventually be transferred to the surroundings and make them warm up
7 of 14
Why is energy often wasted in a machine?
Because of friction between moving parts
8 of 14
What is the energy supplied to a machine often called?
Input energy
9 of 14
What is the input energy equal to?
input energy = useful energy delivered + wasted energy
10 of 14
What are some ways we can reduce energy transfers out of homes?
Loft insulation, cavity wall insulation, double glazing, draught proofing and aluminium foil behind radiators
11 of 14
What does the U-value of a material tells us?
How much energy per second passes through it
12 of 14
What does a lower U-value mean?
The material is a better insulator
13 of 14
What is the U-value of a material equal to?
U-value of the material = energy/s passing per m2 for 1 C temperature difference
14 of 14

Other cards in this set

Card 2

Front

What does the principle of conservation of energy state?

Back

That energy cannot be created or destroyed, it is only possible to change it from one form to another, or transfer it from one place to another

Card 3

Front

Does the total amount of energy ever change?

Back

Preview of the front of card 3

Card 4

Front

What two types of energy we get out of a machine consist of?

Back

Preview of the front of card 4

Card 5

Front

What is useful energy?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Energy resources »