Chapter 1- Energy transfers and efficiency

Question 1

Kinetic Energy

Answer 1

Energy in a moving object- aka movement energy

Question 2

Heat energy

Answer 2

Aka thermal energy

Question 3

Light

Answer 3

Aka radiant energy

Question 4

Gravitational potential energy

Answer 4

Energy stored in raised objects

Question 5

Chemical

Answer 5

Stored energy in fuels, batteries and foods

Question 6

Sound

Answer 6

Energy released from vibrating objects

Question 7

Electrical

Answer 7

Energy in moving charges or static electric charges

Question 8

Elastic potential

Answer 8

Stored energy in stretched or squashed objects

Question 9

Nuclear

Answer 9

Stored in the nuclei of atoms

Question 10

Internal energy

Answer 10

Contained in a thermodynamic system

Question 11

Strain energy

Answer 11

Released when atoms in a molecule rearrange themselves in a chemical reaction

Question 12

Energy transfers

Answer 12

Different forms of energy can be transformed from one form to another.

Question 13

Sankey diagrams

Answer 13

Sankey diagrams summarise all the energy transfers taking place in a process. The thicker the line or arrow, the greater the amount of energy involved.

Question 14

Conservation of energy

Answer 14

Energy can be transferred usefully, stored or dissipitated. It cannot be created or destroyed.

Question 15

Efficiency

Answer 15

The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways

Question 16

Calculating efficiency

Answer 16

The efficiency of a device can be calculated

Efficiency= useful energy out divided by total energy in (for a decimal efficiency)

Or

Efficiency= (useful energy out divided divided by total energy in) x 100 ( for % efficiency)

Question 17

Can energy be created, destroyed or converted?

Answer 17

Energy can only be converted into another form. It cannot ever be created or destroyed. This is called the conservation of energy.

Question 18

Name 10 types of energy

Answer 18

Light
Thermal
Internal
Sound
Elastic potential
Electric potential
Kinetic energy
Chemical potential
Nuclear potential
Gravitational potential

Question 19

Units of energy

Answer 19

Joules (J)

Question 20

Energy is conserved

Answer 20

Energy cannot be made or created, destroyed, lost or disappear

It can be only transformed from one type to the other

Question 21

Power

Answer 21

Calculates the amount of energy delivered per second

Question 22

Calculating power

Answer 22

Power= energy divided by time
P= E/t

Question 23

Units of power

Answer 23

Watts (W) energy must be in joules and time in seconds

Question 24

Work done

Answer 24

A measure of energy

Question 25

Calculating work

Answer 25

``` Work= force x distance W= fxd ```

Question 26

Force is measured in newtons and distance in meters

Answer 26

N and M

Question 27

Light is

Answer 27

Useful energy

Question 28

Thermal is

Answer 28

Wasted energy

Question 29

Efficiency

Answer 29

= useful energy output divided by useful energy input | E= u/t

Question 30

Renewable

Answer 30

Energy that is unlimited

Question 31

Non- renewable

Answer 31

Energy that isnt unlimited

Question 32

Energy resources

Answer 32

Fossil fuel, nuclear fuel and renewable

Question 33

Non renewable energy examples

Answer 33

Cowl Oil Gas

Question 34

Renewable energy resources

Answer 34

``` Nuclear Biomass and biofuel Hydroelectric Wave Tidal Solar wind Geothermal ```