TOPIC 1// Reduce unwanted energy/Efficiency/Energy resources/Wind solar power/ Geothermal Hydroelectrical/ Non renewable/ Bio Fuels

Question 1

What reduces Frictional force

Answer 1

Lubrication

Question 2

What reduces energy transferred by Heating

Answer 2

Insulation

Question 3

Examples of Insulation…

Answer 3

. Cavity wall insulation
.Loft insulation
.Double Glazed windows
.Drought excluders

Question 4

What do cavity walls do

Answer 4

made up of inner and outer wall with an air gap in the middle which reduces energy transferred by conduction through walls.

Question 5

What is cavity wall insulation

Answer 5

Where the cavity wall air gap is filled with foam which can also reduce energy transferred by convetion in wall cavity

Question 6

What is loft insulation

Answer 6

can be laid out across loft floor and ceiling. fibreglass is often used which is a good insulator as it has pockets of trapped air which reduces energy loss by conduction and prevents convection currents being created

Question 7

What is Double Glazed windows

Answer 7

they have an air gap between 2 sheets of glass to prevent energy transfer by conduction through windows

Question 8

What is Drought excluders

Answer 8

placed around doors and windows which reduce energy transfer by convection

Question 9

Efficiency formula

Answer 9

useful output / total imput

Question 10

Name 3 Non - renewable resources

Answer 10

coal
oil
gas

Question 11

Name 7 Renewable energy resources

Answer 11

Sun
Wind
Water waves
Hydro-Electric
Bio fuel
Tides
Geothermal

Question 12

6 facts about wind turbines

Answer 12

1. Each turbine has a generator inside it which generates electricity by turbines moving
2. No pollution
3. Spoil the view
4. Very noisy
5. Impossible to increase supply when extra demand
6. Initial costs are high

Question 13

5 facts about solar energy

Answer 13

1. solar cells generate electric current from the sun
2. No pollution
3. In sunny countries solar power is very reliable
4. You cant increase supply when extra demand
5. initial costs are high

Question 14

6 facts about geothermal power

Answer 14

1. Uses energy from underground thermal energy stores
2. Only possible near volcanic areas where hot rocks lie near to the surface
3. Free energy that is very reliable
4. Can be used to generate electricity or heat building directly
5. Are not many suitable locations for power plant
6. The cost of building power plant is higher compared to amount of energy produced

Question 15

5 facts about Hydro-Electric power

Answer 15

1. Requires a flooding of a valley by building a dam
2. No pollution
3. Valley could be flooded and possible loss of habitat
4. Can provide immediate response to increased demand for electricity
5. initial costs are high

Question 16

7 facts about wave power

Answer 16

1. you need lots of wave-powered turbines
2. No pollution
3. Disturbes the habitats of marine animals
4. Spoils the view
5. Hazard to boats
6. Fairly unreliable since waves tend to die when wind drops
7. initial costs are high

Question 17

What are bio fuels

Answer 17

renewable resources created from either plant products or animal dung which can be burnt to produce electricity

Question 18

What are the 3 pros about bio fuels

Answer 18

1. They are carbon neutral
2. Fairly reliable as crops take short time to grow
3. Cannot respond to immediate energy demands

Question 19

what are 3 cons about bio fuels

Answer 19

1. cost to refine bio fuels so they are suitable for use is very high
2. people worry that growing crops for bio fuel mean there is not enough space to meet demand for crops grown for food
3. In some regions, large areas of forest have been cleared to make space to grow bio fuels, resulting in loss of species