Physics P1 2.3 Useful energy.

HideShow resource information
What is useful energy?
Energy in the place we want it and the form we need it.
1 of 11
What is wasted energy?
Energy that is not useful energy.
2 of 11
Where does useful and water energy both end up?
Being transferred to the surroundings, which become warmer.
3 of 11
What happens as energy spreads out?
It gets more and more difficult to use for further energy transfers.
4 of 11
What is a machine?
Something that transfers energy from one place to another or from one form to another.
5 of 11
What does the energy we get out of a machine consist of?
Useful energy which is transferred to the place we and in the form we want it and wasted energy which is not usefully transferred.
6 of 11
How is energy often wasted by machines?
Because of friction between the moving parts of a machine, this energy warms the machine and the surroundings.
7 of 11
When is friction useful?
In the brakes of a bicycle or a car some of the kinetic energy of the vehicle is transferred to energy heating the brakes.
8 of 11
What happens to the wasted energy from a lightbulb?
It is transferred to the surroundings which get warmer.
9 of 11
Why should we talk about energy being 'wasted' not energy being 'lost'?
Because the law of conservation tells us that energy cannot be destroyed.
10 of 11
**SOMETIMES WASTED ENERGY IS TRANSFERRED AS SOUND, BUT THE AMOUNT IS USUALLY VERY SMALL. THIS ENERGY WILL ALSO EVENTUALLY BE TRANSFERRED TO THE SURROUNDING AREA**
**
11 of 11

Other cards in this set

Card 2

Front

What is wasted energy?

Back

Energy that is not useful energy.

Card 3

Front

Where does useful and water energy both end up?

Back

Preview of the front of card 3

Card 4

Front

What happens as energy spreads out?

Back

Preview of the front of card 4

Card 5

Front

What is a machine?

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 »