Energy

Question 1

Name the nine types of energy

Answer 1

kinetic
thermal
elastic
chemical 
sound 
light
nuclear
electrical
gravitational

Question 2

“Energy is lost in transfer”. Do you agree with this statement?

Answer 2

No energy is lost in the transfer. Everything that goes in must come out somewhere.

Question 3

What is Kinetic energy?

Answer 3

This energy is movement

Question 4

Give the energy transfer for a hair dryer.

Answer 4

Electrical energy transfers into thermal, sound and kinetic energy.

Question 5

Give the energy transfer for a laptop.

Answer 5

Electrical energy transfers into thermal, light and sound energy.

Question 6

What is Elastic potential energy?

Answer 6

Anything that is squashed or pressed e.g. chewing gum

Question 7

What is Electrical energy?

Answer 7

The energy found in a current.

Question 8

What is Light energy?

Answer 8

This energy is light vision.

Question 9

What is Nuclear Energy?

Answer 9

Nuclear energy is found in a nuclear of an atom.

Question 10

What is Thermal energy?

Answer 10

Thermal energy is for heat.

Question 11

Name the non-renewable sources of energy

Answer 11

Oil
Gas
Nuclear

Question 12

The definition of Efficiency

Answer 12

A device which has very little waste energy is a more efficient device.

Question 13

What is chemical energy?

Answer 13

food and fuel

Question 14

What is sound energy?

Answer 14

vibration

Question 15

What is gravitational potential energy?

Answer 15

gravitational pull (stored energy)

Question 16

Name the renewable sources of energy

Answer 16

solar
hydro-electric
biomass
wind

Question 17

what is the efficiency formula?

Answer 17

efficiency = useful energy out (divided by) useful energy in

Question 18

Is a devise which has very little waste energy a more efficient or less efficient device?

Answer 18

more efficient

Question 19

What is the cost of electricity formula?

Answer 19

cost of electricity = number of units x cost per unit

Question 20

Give the energy transfer for a kettle.

Answer 20

Electrical energy transfers into thermal and sound energy.

Question 21

What is the formula equation for ‘the cost of electricity’ (pence)?

Answer 21

Cost of electricity = number of units x cost per unit (p)

Question 22

What is the formula for the number of units (kWh)?

Answer 22

Number of units = Power (KW) x Time (h)

Question 23

In a Sankey diagram what does the useful and wage energy add up to?

Answer 23

The total INPUT ENERGY of an appliance

Question 24

How do you get from minutes into a decimal figure? (E.g. 35 mins)

Answer 24

You do (35/60) as there are 60 mins in an hour

Question 25

What is 45 minutes in a decimal number?

Answer 25

0.75

Question 26

What is 30 minutes in a decimal number?

Answer 26

0.5

Question 27

What is 15 minutes in a decimal number?

Answer 27

0.25

Question 28

What is the efficiency of a washing machine that has USEFUL energy of 45J and has an INPUT energy of 70J?

Answer 28

1) 70-45 = 25J (wasted energy) 2) efficiency = useful/total x100 3) efficiency = 45/70 x 100 = 64%

Question 29

Give 4 examples of what to consider when comparing appliances?

Answer 29

~ cost to install ~ cost to run ~ impact on the environment ~ time efficiency (what one is quicker to use)

Question 30

Where does biomass energy come from?

Answer 30

Living things (e.g. Wood from trees)

Question 31

What are the 2 most common types of waste energy from an appliance?

Answer 31

Sound and Thermal

Question 32

Where does the wasted energy go?

Answer 32

All wasted energy eventually dissipates (spreads) to the surroundings

Question 33

What does dissipate mean?

Answer 33

Spreads