# Circuits and Components

In this worksheet, students will answer questions about the functioning of components in simple elecrical circuits.

Key stage:  KS 2

Curriculum topic:   Electricity

Curriculum subtopic:   Simple Circuits

Difficulty level:

### QUESTION 1 of 10

You are forever using things that use electricity - right?  Many of them have to be plugged into 'the mains'.

Our homes are wired up to the MAINS - we use MAINS ELECTRICITY every day to make our work easier. Also, the appliances themselves also contain circuits inside them - inside your washing machine, TV, etc. are circuit boards and masses of different circuits.

We know that ELECTRICAL ENERGY is changed into, for example:

• LIGHT
• SOUND
• HEAT
• MOVEMENT

Because MAINS ELECTRICITY is very powerful and dangerous, we use materials which insulate us and keep us safe when we are using electrical appliances. These materials are NON-METALS, for example: plastics, and are used to cover the metal wires which conduct the electrical energy.

Use all this information and your knowledge as you work your way through this worksheet.

Adam and Helena are making circuits. They collect together the components they need.

Which ONE of the components in the list below changes electrical energy into movement?

wire

bulb

battery

motor

Helena wants a component which produces sound.

Pick the one from the list which she should choose.

bulb

battery

buzzer

wire

Of the four components in the list, which one makes a 'gap' in the circuit?

bulb

insulating material

switch

wire

Below are five situations in which electricity is involved.

Tick the THREE which could include a switch which could stop the flow of electricity

lightning storm

mains electricity

an appliance

static electricity

battery

Electricity travels through metal wires. Which material are the electrical wires surrounded by?

metal

plastic

fabric

wood

Complete the following sentence:

In our household appliances, electrical conductors are surrounded by plastic so that.........

so it doesn't hurt if we step on the wire

the electricity doesn't escape

we don't get an electrical shock

Complete the following sentence:

Materials which DO NOT allow electricity to flow though them are called..........

insulators

switches

conductors

Complete the following sentence:

Materials which ALLOW electricity to flow them are called...........

insulators

metals

conductors

switches

Choose one of the following, from the list below, to complete the sentence:

Generally, electrical insulators are............

plastic

metals

non-metals

wooden

• Question 1

Adam and Helena are making circuits. They collect together the components they need.

Which ONE of the components in the list below changes electrical energy into movement?

motor
EDDIE SAYS
When the motor is connected up, it whizzes around - that, of course, is electricity being used to create movement. The wire carries the electric current, which is provided by the energy stored in the battery, while the bulb lights up and converts electrical energy into light (and heat).
• Question 2

Helena wants a component which produces sound.

Pick the one from the list which she should choose.

buzzer
EDDIE SAYS
Yes, the buzzer produces an annoying 'buzzing' sound when it's connected into the circuit! The bulb will only produce light and heat.
• Question 3

Of the four components in the list, which one makes a 'gap' in the circuit?

switch
EDDIE SAYS
Look around your room for switches... They are used to make a break or GAP in the circuit so that the electricity CANNOT FLOW. The gap in the switch has air in between the contacts and air is an insulator, so no current flows.
• Question 4

Below are five situations in which electricity is involved.

Tick the THREE which could include a switch which could stop the flow of electricity

mains electricity
an appliance
battery
EDDIE SAYS
Did you work that one out? You can switch off electricity at the mains, at a wall socket, or on an apppliance. You can also move the switch on your torch to cut the current from the battery. Lightning doesn't have a switch (now, there's a thought!) and static electricity is a build-up of electric charge on you or an object (like the mini shock you get sometimes when you touch the metal leg of your school chair).
• Question 5

Electricity travels through metal wires. Which material are the electrical wires surrounded by?

plastic
EDDIE SAYS
As you probably know, non-metals are usually electrical insulators. So wood and fabric would work from a non-metal point of view, but not in terms of flexibility, etc. - plastic is much better.
• Question 6

Complete the following sentence:

In our household appliances, electrical conductors are surrounded by plastic so that.........

we don't get an electrical shock
EDDIE SAYS
All might seem sensible answers but, of course, the plastic covering is there to protect us. The electric current running through the metal wires would give you a nasty shock, so the plastic keeps us and the metal apart.
• Question 7

Complete the following sentence:

Materials which DO NOT allow electricity to flow though them are called..........

insulators
EDDIE SAYS
Guess you knew that! Insulators don't allow electric current to flow through them: plastic, wood, glass, paper, cooking oil, air - lots and lots!
• Question 8

Complete the following sentence:

Materials which ALLOW electricity to flow them are called...........

conductors
EDDIE SAYS
That might have needed a moment's thought. 'Conductors' is the best answer as it covers all things that allow electric current to pass through them. Metals are not the ONLY materials which conduct electricity, although very few non-metals conduct electricity. One important example is WATER, especially sea water, and another is GRAPHITE (that's pencil lead). But there aren't that many non-metal conductors compared with metals.
• Question 9

Choose one of the following, from the list below, to complete the sentence:

Generally, electrical insulators are............

non-metals
EDDIE SAYS
A PROPERTY of most non-metals is that they DO NOT conduct electricity. Plastics and wood are examples of non-metals but there are thousands more. That's why 'non-metals' is the best answer. Got that all right?
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