Hazards with Electricity

In this worksheet, students will learn about the correct use of electricity.

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Current Electricity

Difficulty level:

QUESTION 1 of 10

Electricity can be very dangerous if not used properly. At home, mains electricity is used, which has a much higher voltage than the cells used at school. It can be extremely dangerous.

The general safety rules when handling electricity are:

- Never touch the metal parts of plugs (see a plug inserted into a socket in the diagram)
- Never poke things into sockets
- Keep water away from electrical appliances (water is a conductor of electricity).

In science lessons:

- Always show your circuits to your teacher before switching them on
- Switch the current off before changing your circuit.

Electricity can be controlled by using a switch. When the switch is open, there is a gap in the circuit, so electric current cannot flow. When we close the switch there is a complete circuit for the current to flow around. The diagram shows a complete circuit with an open and then a closed switch. In science, we call the battery a cell, but actually a battery consists of many cells in a row.

All wires are metal because metals conduct electricity, but they are covered in plastic to insulate us from the electricity and so avoid accidents. Have a look at the wires this plug contains:

You can see the multi-coloured wires for Earth (yellow/green), Live (brown) and Neutral (blue).  As almost all appliances come with a fitted and sealed plug, it's not as vital to learn how to wire a plug as it once was.

Which one uses higher voltage?

Cell

Mains electricity

Is this statement true or false?

A general safety rule when handling electricity is to touch the plastic parts of a wire.

True

False

Is this statement true or false?

Never poke things into sockets.

True

False

Complete this sentence.

Water is a  ______________ of electricity.

conductor

insulator

Is this statement true or false?

In your science lessons, you should always try different combinations of connecting equipment to invent your own circuit.

True

False

Is this statement true or false?

True

False

What piece of equipment can we use to control electricity flowing through a circuit?

Is this statement true or false?

An open switch lets electricity flow through the circuit.

True

False

What is a battery?

A cell

Two or more cells

Complete this sentence.

Plastic is an electrical _____________.

conductor

insulator

• Question 1

Which one uses higher voltage?

Mains electricity
EDDIE SAYS
Mains electricity uses much higher voltage than a cell at school.
• Question 2

Is this statement true or false?

A general safety rule when handling electricity is to touch the plastic parts of a wire.

False
EDDIE SAYS
This is a tricky question. Avoid touching any part of a wire. The rule is never to touch any parts of a wire or plug, especially bare metal parts, while electricity is on.
• Question 3

Is this statement true or false?

Never poke things into sockets.

True
EDDIE SAYS
It is true, we should never poke things into sockets.
• Question 4

Complete this sentence.

Water is a  ______________ of electricity.

conductor
EDDIE SAYS
Water is a conductor of electricity.
• Question 5

Is this statement true or false?

In your science lessons, you should always try different combinations of connecting equipment to invent your own circuit.

False
EDDIE SAYS
To be honest, it's more important to follow the instructions to complete the circuit - learning to convert circuit diagrams into real circuits is a skill you need to learn. Later on, you can try things out, once you understand better how they work and how to predict what is likely to happen.
• Question 6

Is this statement true or false?

False
EDDIE SAYS
It's good practice, especially when you are starting to learn about circuits, to check with your teacher that you've connected it properly before switching it on.
• Question 7

What piece of equipment can we use to control electricity flowing through a circuit?

Switch
EDDIE SAYS
A switch can be used to control electricity flowing through a circuit.
• Question 8

Is this statement true or false?

An open switch lets electricity flow through the circuit.

False
EDDIE SAYS
An open switch creates a gap in the circuit, so electricity cannot flow through. The statement is false.
• Question 9

What is a battery?

Two or more cells
EDDIE SAYS
A battery is made up of two or more cells.
• Question 10

Complete this sentence.

Plastic is an electrical _____________.

insulator
EDDIE SAYS
Plastic is an electrical insulator.
---- OR ----

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