Electricity

Question 1

What are the four main types of energies?

Answer 1

Heat, light, sound and movement.

Question 2

A TV use what kinds of energies?

Answer 2

Heat, light and sound.

Question 3

A dishwasher uses what kind of energies?

Answer 3

Heat, sound and movement.

Question 4

A kettle uses what kind of energies?

Answer 4

Heat and sound

Question 5

What is an electrical circuit?

Answer 5

An electrical circuit is a system for transferring energy from one place to another.

Question 6

What is a conductor? Give Example.

Answer 6

A conductor is something that can allow electricity through it. Eg iron

Question 7

What is an insulator? Give Example.

Answer 7

An insulator is something that does not allow electricity through it. Eg Plastic, Rubber, Ceramic, glass, wood.

Question 8

What is a poor conductor? Give Example.

Answer 8

A poor conductor is some that can let electricity through it self aka a semiconductor. Eg water.

Question 9

What is a device?

Answer 9

A device is a man-made objects to do a specific job.

Question 10

List three objects and say what electrical energy they use.

Answer 10

Bulb = Heat and Light
Buzzer = Sound
Motor = Movement and Sound

Question 11

Name 7 items used in making a circuit.

Answer 11

A cell, Battery, Connecting wire, Lamp/Bulb, Switch, Buzzer and a Electric Motor

Question 12

Describe a cell.

Answer 12

It can be changed into electrical energy, it has two terminals - Positive and negative terminals and tells you how much volts is on the cell.

Question 13

What is a series circuit?

Answer 13

When the all the circuit things are in a chain like position.

Question 14

What is a parallel circuit?

Answer 14

A parallel circuit is a circuit that is made in such a way that it has two or more different circuits.

Question 15

What would you use to put out an electrical fire?

Answer 15

Sand or a chemical fire extinguisher. Not water.

Question 16

What would you do if someone is being electrocuted?

Answer 16

Don’t touch them as you will get an electric shock. Use an object that does not conduct electricity - wood, rubber or plastic object.

Question 17

Three tips when using electrical appliances:

Answer 17

1. Make sure it is unplugged if filling with water (kettle, iron).
2. Do not use if you can see the wires.
3. Do not use in the bathroom eg heater near the bath, hairdryer near the sink.

Question 18

Why do we have insulators?

Answer 18

To protect us from the dangers of electricity.
They stop the electricity from going to other parts of the system where it may cause a fire or other damage or injure a person.

Question 19

What do electricians do?

Answer 19

They know about electricity and hot to work with it safely.

Question 20

What are fossil fuels?

Answer 20

The remains of dead plants and animals that store energy from the sun from millions of years ago.

Question 21

Give some examples of fossil fuels:

Answer 21

Coal, Oil and natural gas.

Question 22

Where does the energy in fossil fuels come from?

Answer 22

The Sun.

Question 23

How are fossil fuels formed:

Answer 23

Pressure from above and heat from the earth over millions of years.

Question 24

How was coal formed. 4 Comments:

Answer 24

1. Huge ferns and forest grew and they absorbed the energy from the sun millions of years ago.
2. Plants died and formed into layers of rotting material. Overtime pressure from above packed layers together to form Peat.
3. Dead sea animals made lignate.
4. Sand and mud piled on top, more pressure occured and heat inside the earth turned liginate and peat into coal.

Question 25

What is a non renewable resource?

Answer 25

Something that cannot be replaced when used up. eg Coal.

Question 26

What is a renewable resource?

Answer 26

Something that can be replaced when used eg water, trees.

Question 27

How is most of our electricity made in South Africa?

Answer 27

By coal burning Power Stations.

Question 28

Look at Power Station Pic… describe each stage:

Answer 28

Look at pic.