Electricity

Question 1

What is electricity?

Answer 1

Electricity is a form of energy

Question 2

Name three other forms of energy that electricity is usually converted to

Answer 2

. Light
. Movement
. Sound

Question 3

For an appliance to work it needs a source of _________.

Answer 3

Energy

Question 4

What is a cell?

Answer 4

They provide the energy needed for electrons to move around in an electric circuit

Question 5

What does a circuit do?

Answer 5

A circuit provides a pathway for electricity to flow from an energy source, such as a cell, to where it is needed and back to the source

Question 6

The pathway needs to form a _______ loop.

Answer 6

Closed

Question 7

What is a circuit board?

Answer 7

Metal pathways printed on a board

Question 8

Name three forms that electrical circuit can take.

Answer 8

Closed loop made of electrical wires
Circuit board
Pylons

Question 9

Electric circuits are made of different parts. These parts are called _________.

Answer 9

Components

Question 10

What are the components of an electric circuit?

Answer 10

. A source of energy
. Conducting material
. Devices
. Switches

Question 11

What is “A source of energy”?

Answer 11

Each circuit needs a source of electrical energy. Cells and batteries are one source of electrical energy in an electric circuit.

Question 12

What are the 2 sides of a battery called?

Answer 12

The positive and negative side

Question 13

How do you connect 2 batteries correctly?

Answer 13

The positive side of one battery must be connected to the negative side of the next battery

Question 14

What is “Conducting material”?

Answer 14

A materials that electricity can flow through

Question 15

What do conducting materials do?

Answer 15

They carry the electric current from the energy source to the other parts of the electric circuit

Question 16

What is an electrical current?

Answer 16

The movement of electric charges through a conductor

Question 17

What are most conducting wires made of?

Answer 17

Copper

Question 18

What are the wires usually covered by?

Answer 18

Plastic

Question 19

Why are most wires covered in plastic

Answer 19

Plastic doesn’t conduct electricity

Question 20

What is the layer of plastic called?

Answer 20

Insulation

Question 21

Why are electrical wires insulated?

Answer 21

To keep the electrical current from flowing where it is not wanted

Question 22

What is “Devices”?

Answer 22

Man-made objects made to do a specific job. Different devices are used in electric circuits to convert electrical energy to other forms of energy such as light, sound or movement.

Question 23

Name some examples of devices.

Answer 23

Bulbs
Buzzers
Motors

Question 24

Bulbs convert electrical energy into ________ energy.

Answer 24

Light

Question 25

The light a bulb gives of is called the ________ energy.

Answer 25

Output

Question 26

We say that a bulb is a/an __________ device.

Answer 26

Output

Question 27

What are 3 types of bulbs?

Answer 27

Compact fluorescent bulb Incandescent bulb Torch bulb

Question 28

What is a buzzer?

Answer 28

An electrical device that makes a buzzing sound

Question 29

A buzzer converts the electrical energy to ________ energy.

Answer 29

Sound

Question 30

Electric motors convert electrical energy into _________ energy.

Answer 30

Movement

Question 31

What happens when electrical current passes through a motor?

Answer 31

It causes the shaft to spin

Question 32

How can the spinning movement of the shaft be used?

Answer 32

Household appliances: fans, washing machines Tools: drills, grinders

Question 33

What do you call a circuit with gaps in it

Answer 33

Broken

Question 34

What is a switch?

Answer 34

It can be added to a circuit to start and stop the flow of an electric current.

Question 35

When are switches useful?

Answer 35

When you want to turn an appliance on or off without having to plug it in or unplug it

Question 36

True or false. All electrical appliances have switches.

Answer 36

True

Question 37

What is a circuit diagram

Answer 37

Diagram of electric circuit, drawn using standard symbols for electrical components

Question 38

What is the difference between a cell and a battery?

Answer 38

A battery is made up of two or more cells

Question 39

Correct the sentence. Most metals conduct electricity and so does water, including lemon water.

Answer 39

Lemon=salty

Question 40

Why is it important to know which materials conduct electricity?

Answer 40

It can help you use electricity safely. It may even save your life!

Question 41

Why do we get a shock when we touch an uninsulated wire?

Answer 41

Our bodies are made mostly of water. This means that we can conduct electricity. If electricity goes through a person's body, it can cause serious damage or even kill the person

Question 42

What should you use to put out an electrical fire?

Answer 42

NEVER PUT IT OUT WITH WATER!! Use sand or a chemical fire extinguisher instead.

Question 43

What are insulators?

Answer 43

Materials that do not allow electricity to go through

Question 44

List some insulating materials.

Answer 44

Plastic Rubber Ceramics Glass Most other materials that are not made of metal

Question 45

What do you do if the insulation of an electrical cord is damaged?

Answer 45

Replace the cord before the appliance is used again. It must be replaced by an adult who knows how to do it safely. A qualified electrician must work on damaged wiring in a household circuit

Question 46

Transmission lines are attached to pylons by insulators. What are these usually made of?

Answer 46

Ceramic material or toughened glass

Question 47

What do the insulators on pylons do?

Answer 47

Stop the electricity from going from the cables into the metal pylons

Question 48

What is the input device for most circuits?

Answer 48

A battery

Question 49

What types of energy does the falling water in a watermill go through?

Answer 49

Starts: potential energy Turns to: movement energy that makes the wheel turn

Question 50

What are the 3 parts of an electrical energy system?

Answer 50

Input Output Process

Question 51

What is "input"?

Answer 51

What goes into the circuit It can be the electrical energy from a battery or mains electricity

Question 52

What is "output"?

Answer 52

What is released from the circuit It can be light from a bulb or heat from the element of a heater

Question 53

What is "process"?

Answer 53

The manner in which the input is changed into the output. For example, the electric current in a circuit heats up the element of a heater. Electrical energy is changed into heat

Question 54

What can we use a systems diagram for?

Answer 54

To show what happens in an electrical system

Question 55

What is mains electricity?

Answer 55

Electricity from a power station that is transferred in a circuit to our homes and back to the power station

Question 56

What is the most common source of energy in SA?

Answer 56

Coal