Energy And Electricity Emma

Question 1

How are humans able to store energy?

Answer 1

Humans are able to take the energy from the sun and store it in a cell or battery.
This energy can then be used when needed

Question 2

What are cells and batteries

Answer 2

A cell is the smallest whole part of a battery

A battery is a group of cells

Question 3

How do cells and batteries store energy?

Answer 3

They store energy in the form of electricity

Question 4

Where do we use batteries?

Answer 4

Cars
Radios
Torches
Drills
Cell phones
Clocks
Laptops
Lots more

Question 5

What is inside a battery?

Answer 5

A battery is full of chemicals which make electrical energy

Question 6

What are the 2 ends of a battery called?

Answer 6

They are called terminals.
One end of the cell is positive and the other is negative
+ positive
- negative

Question 7

How does energy move in the battery?

Answer 7

The chemicals in a cell give off electrical energy. This energy flows from the negative terminal to the positive terminal very quickly.

Question 8

What is a circuit?

Answer 8

A circuit is a system that transfers electrical energy to where it is needed.

Question 9

What is a system made up of?

Give 2 examples

Answer 9

It is made up of 2 or more parts. These pets work together to do useful things.
A pestle and mortar work together to grind spices, seeds and nuts

A can opener has many parts that work together to grip, turn and cut into a can. This allows us to open cans

Question 10

What is an electrical system?

Answer 10

An electrical system is called a circuit

Question 11

What does a simple circuit consist of?

Answer 11

A battery
Electrical wire
Light bulb
Light bulb holder

Question 12

Explain how a simple electrical circuit works

Answer 12

When connected together the parts make an electrical circuit and the light bulb will shine.

Question 13

How does electrical energy move?

Answer 13

Very quickly. It flows in the following ways:

• Starts at the negative terminal and flows to the positive terminal
• from the positive terminal it flows through the wire
• from the wire it flows through the light bulb and the bulb lights up
• from the light bulb the energy flows through the wire back to the negative terminal

Question 14

When will the bulb stop shining?

Answer 14

When the energy is used up or the circuit is broken

Question 15

What is a closed circuit

Answer 15

When the circuit is connected and the bulb is shining the circuit is a closed circuit

Question 16

What is an open circuit

Answer 16

When there is a break in the circuit it is an open circuit.

Question 17

How do we use electricity safely?

Answer 17

Electricity is dangerous if we don’t use it properly. Electricity from a wall socket can kill someone. Our bodies are good conductors of electricity.

Question 18

How do we know if there is a problem with an appliance?

Answer 18

If:
The controls do not work properly
Any part of the appliance is broken or missing
Parts are loose

Question 19

How do we practise plug safety

Answer 19

Use SABS approved plugs
Use an adaptor, don’t overload wall sockets
Do not pull a plug out by the cord
Switch off the socket before pulling out the plug
Don’t put anything other than plugs into the wall socket
Cover unused sockets with safety plugs

Question 20

How do we get electricity from power stations?

Answer 20

Electricity which is made at power stations travels through pylons, substations and electricity boxes in a giant circuit, to our homes. After an appliance has used electricity, it flows back to the National Grid.

Question 21

What do power stations need to produce electricity?

Answer 21

They need a source of energy, or fuel

Question 22

What do power stations in South Africa use to produce electricity?

Answer 22

Most of them use coal. South Africa has a lot of coal.
Coal fired power stations burn coal and energy (in the form of heat) is given off. This heat is used to make electricity.

Question 23

What sources does South Africa use to produce electricity?

Answer 23

Hydro electric power from water
Wind turbines from wind
Nuclear power stations
Gas turbines
Solar panels