Energy

Question 1

Recall some forms of Energy

Answer 1

Chemical, electrical, light, strain, thermal, sound, magnetic, kinetic, gravitational potential

Question 2

State an example of Chemical energy

Answer 2

battery, food

Question 3

State an example of electrical energy

Answer 3

lightbulb, switch

Question 4

State an example of strain energy

Answer 4

elastic band

Question 5

State an example of light energy

Answer 5

sun, lightbulb

Question 6

State an example of gravity potential energy

Answer 6

holding up an object

Question 7

State an example of thermal energy

Answer 7

sun, fire

Question 8

State an example of sound energy

Answer 8

speaker, drill

Question 9

State an example of magnetic energy

Answer 9

magnet

Question 10

State an example of kinetic energy

Answer 10

bike, car

Question 11

What is the the principle of conservation of energy?

Answer 11

‘The principle of conservation of energy states that energy cannot be created or destroyed merely transferred from one form to another

Question 12

What is one Joule approximately the energy that is needed to do?

Answer 12

1J is approximately the energy needed to lift an apple vertically up 1m.

Question 12

What does all energy eventually become?

Answer 12

Thermal energy

Question 13

What is energy measured in?

Answer 13

joules - J

Question 14

What do energy transfer diagrams show?

Answer 14

Energy in ——> device ——–> Energy out

The transfer of energy

Question 15

Sankey Diagrams

Answer 15

look in book

Question 16

What is renewable energy?

Answer 16

Renewable energy is defined as energy that is collected from resources that will never run out or which are naturally replenished within a human lifetime

Question 17

What are the Advantages of Sunlight

Answer 17

Free
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.

Question 18

What are the Advantages of wind

Answer 18

Free
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream

Question 19

What are the Advantages of Hydroelectric

Answer 19

Free electric
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.
Can control when power is
produced.

Question 20

What are the Advantages of Tidal

Answer 20

Free electric
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.
Predictable power output.

Question 21

What are the Advantages of Waves

Answer 21

Free electric
No GHG emitted.
Will not run out.
Develop a revenue stream.
Predictable power output

Question 22

What are the Advantages of Geothermal heat

Answer 22

Free.
No GHG emissions.
Reduce bills.
Hot water can be
stored.

Question 23

What are the Advantages of Woods

Answer 23

Will not run out (if replanted)
Can be stored for future use.
Can be grown locally

Question 24

What are the Disadvantages of Sunlight

Answer 24

Intermittent Low values near each pole.

Question 25

What are the Disadvantages of Wind

Answer 25

Intermittent High initial costs.

Question 26

What are the Disadvantages of Hydroelectric

Answer 26

Need the correct topography of ground. Huge initial investment.

Question 27

What are the Disadvantages of Tidal

Answer 27

Need the correct topography of ground. large initial investment.

Question 28

What are the Disadvantages of Waves

Answer 28

Oil spills. Habitat destruction. Visual impact.

Question 29

What are the Disadvantages of Wood

Answer 29

Overuse. Does give out CO2.

Question 30

What is efficiency?

Answer 30

Efficiency is a measure of how good a device is at changing energy from one form to another.

Question 31

What are the Disadvantages of Geothermal heat

Answer 31

Expensive to set up. Leaks into ground.

Question 32

Can a device have 100% efficiency?

Answer 32

No, as all devices waste energy

Question 33

Why is an energy efficient light bulb is more efficient than a filament bulb.

Answer 33

It wastes less energy and coverts a greater proportion of the energy supplied into light energy and not heat.

Question 34

How is energy efficiency calculated?

Answer 34

Energy efficiency = Useful Output Energy/Total Input Energy eff = Eout/Ein Useful and total energy is measured in Joules - J

Question 35

Why is it important that electrical appliances display information about their energy efficiency.

Answer 35

It helps the consumer to identify which appliance will use the least energy and cost the least to run.

Question 36

What are the units of energy efficiency?

Answer 36

It does not have any units, it is a number between 0-100 which can be converted into a percentage by multiplying by 100