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Flashcards in P1: Energy Deck (18)
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1

What is the law of conservation of energy?

No energy is created or destroyed but it is transferred

2

What is the gravitational potential energy?

The energy gained when raising an object above ground
Weight(N/kg)= mass(kg) x gravitational field (N) x height

3

Elastic potential energy

1/2 x spring constant(N/m) x extension(squared)(m)

4

Work done:

Work done (j) = force(N) x distance

W= Fx s

5

Efficiency

Efficiency= useful output / total input x100

6

Energy resources(8):

Geothermal= renewable.
Solar= renewable.
Tidal= renewable.
Hydroelectricity= renewable.
Fossil fuels= non-renewable
Nuclear= non-renewable
biofuels= renewable.
Wind =renewable

7

Kinetic energy:

1/2 x mass(kg) x velocity (squared)(m/s)

Er= 1/2 x m x v^2

8

Insulating a building(2)

- Insulation reduces the amount of energy transfer by conduction.
- The lower the thermal conductivity of the insulating material and the thicker the layer the more the rate of energy transfer is reduced.

9

Dissipation(definition):

When energy is given out to the surroundings

10

Energy store(definition):

The capture of energy produced at one time for use at a later time

11

Energy transfer(definition):

The conservation to one type of energy to another form

12

Density:

Mass/volume

P=m/v

13

What are biofuels?

Energy resources made by burning plants and also animal waste

14

Mechanical energy transfer:

To do with movement

15

What is an environmental problem caused by generating electricity using hydro-electro power?

It could result in a loss of habitat for some species

16

Some energy is always ........... when an electrical device is used

Wasted

17

Energy stores(6):

- Nuclear
- Vibrational
- Elastic potential
- Chemical
- Kinetic
- Gravitational potential

18

Fossil fuels(

- Non renewable
- Reliable
-