Energy

Question 1

What ar the main stores of energy ?

Answer 1

Magnetism
Thermal
Chemical
Kinetic
Electrostatic
Elastic
Gravitational potential
Nuclear

Question 2

What are the 4 energy transfers ?

Answer 2

Force

Electricity

Thermal

Radiation

Question 3

What are energy flow diagrams used for ?

Answer 3

Diagrams can be used to show how energy is transferred from one store to another

Question 4

What is energy dissipation ?

Answer 4

Whenever there is a change in a system, energy is transferred and some of that energy is dissipated

Question 5

What can energy be and not be ?

Answer 5

Can be transferred, stored and dissipated

Can not be destroyed

Question 6

What is work done ?

Answer 6

When a force is acting on a body

Question 7

What is power measured in ?

Answer 7

Watts

Question 8

What is work done measured ?

Answer 8

Joules

Question 9

what is efficiency ?

Answer 9

Whenever there is a change in a system, energy is transferred and some of that energy is dissipated

Question 10

What will a very efficient device not do ?

Answer 10

A very efficient device will waste very little of its input energy

Question 11

What will Very inefficient device do ?

Answer 11

A very inefficient device will waste most of its input energy

Question 12

What are good conductors ?

Answer 12

Metals

Question 13

What type of metals are good conductors ?

Answer 13

Aluminium

Copper

Steel

Question 14

What does heat act on ions in metal ?

Answer 14

Make them move faster this means energy is transferred fast as they are close together

Question 15

What are ways of keeping a house warm ?

Answer 15

Double paned windows

Insulation in walls and roof

Question 16

what’s the steps to the insulation practical ?

Answer 16

1. Place a small beaker into a larger beaker.
2. Fill the small beaker with hot water from a kettle.
3. Put a piece of cardboard over the beakers as a lid. The lid should have a hole.
4. Place a thermometer into the smaller beaker through the hole.
5. Record the temperature of the water in the small beaker and start the stopwatch.
6. Record the temperature of the water
7. Repeat steps 1-6, each time
8. Plot a graph of temperature (y-axis) against time (x-axis).

Question 17

What are factors that depend on how a material changes temperature ?

Answer 17

Mass

Substance

The bp and mp

Question 18

What are the steps to the specific heat capacity practical ?

Answer 18

1. Place the immersion heater into the central hole at the top of the block.
2. Place the thermometer into the smaller hole
3. Fully insulate the block by wrapping it loosely with cotton wool.
4. Record the temperature of the block.
5. Connect the heater to the power supply
6. After ten minutes the temperature will still rise even though the heater has been turned off and then it will begin to cool.

Question 19

What is specific heat capacity ?

Answer 19

the energy required to raise 1kg of the material by 1°C.

Question 20

What are the main energy resources ?

Answer 20

Fossil fuels
Nuclear
Hydroelectric
Geothermal
Wind
Solar power

Question 21

Whats energy needed for ?

Answer 21

Homes

Public services

Factories

Transport

Question 22

What is renewable recource ?

Answer 22

Can be reused or renewed

Question 23

Whats a non renewable recource ?

Answer 23

Cannot be reused or renewed