# Building Circuits 1

In this worksheet, students will answer questions about how to build a simple circuit and how electricity travels around it.

Key stage:  KS 2

Curriculum topic:   Electricity

Curriculum subtopic:   Lamps and Circuits

Difficulty level:

### QUESTION 1 of 10

Circuits are a great way to find out about how electricity works, at the basic level.  You also find out about lots of different components.

A simple circuit is built using a power source - we use batteries because they are safe.  Then wires carry the electrical energy from the source to the device that's plugged into the circuit, like a bulb (lamp) or a buzzer.

We can use a switch in the circuit so that the device can be turned on/off without having to disconnect the battery. The switch also allows us to save energy.

Devices in a circuit change the electrical energy into light, sound or movement.

Right, with those basics about electrical circuits in mind, let's have a look at how to put them together.

So, to provide the ENERGY to make the electricity go round the circuit, what do you need?

bulb

battery

motor

switch

So, the electrical energy travels around the circuit through the.........

switch

battery

buzzer

wires

Here are four components you might find in an electrical circuit.

Which one of these components shows that the electrical energy is flowing around the circuit?

switch

wires

bulb

battery

Complete this sentence:

To allow the electricity to flow the switch must be........

open

closed

Keisha makes a simple circuit using:

• a bulb
• a battery
• wires

The bulb lights up. After a short time, the bulb goes out.

Which THREE of these must Keisha check to find out why the electricity is not flowing?

the wire connections

the time

the bulb

the mains

the battery

Keisha decides to check the bulb by taking it out and replacing it with a device which changes electrical energy into sound.

This device is called a........

switch

buzzer

motor

The buzzer works in the circuit. This tells Keisha that........

the battery was flat

it's time to get ear-plugs

Keisha adds a switch to the circuit.

When the switch is open, the electricity........

jumps the gap

leaks out

cannot flow

Choose from the list which device must Keisha use to change electrical energy into movement

a motor

a wheel

a switch

• Question 1

So, to provide the ENERGY to make the electricity go round the circuit, what do you need?

battery
EDDIE SAYS
Batteries are amazing: when connected into a circuit the energy they have stored in them allows electricity to flow around the circuit, lighting bulbs, buzzing buzzers and whizzing motors!
• Question 2

So, the electrical energy travels around the circuit through the.........

wires
EDDIE SAYS
The electrical energy from the battery travels through the wires to the device. The circuit must be a complete loop, without any gaps.
• Question 3

Here are four components you might find in an electrical circuit.

Which one of these components shows that the electrical energy is flowing around the circuit?

bulb
EDDIE SAYS
When the bulb is lit, the electricity is flowing around the circuit. Easy! The battery produces the energy for the electricity to flow (a bit like a pump), the wires carry it along and the switch cuts it off, if it's open.
• Question 4

Complete this sentence:

To allow the electricity to flow the switch must be........

closed
EDDIE SAYS
An open switch makes a gap in the circuit, stopping the flow of energy. Air is a bad conductor of electricity. When the switch is open there is just air between the electrical contacts, which is why no electricity flows between them. Result? No electricity flowing = no bulb lit/buzzer buzzing/etc..
• Question 5

Keisha makes a simple circuit using:

• a bulb
• a battery
• wires

The bulb lights up. After a short time, the bulb goes out.

Which THREE of these must Keisha check to find out why the electricity is not flowing?

the wire connections
the bulb
the battery
EDDIE SAYS
So what may have happened? The battery might have "run down", the bulb may have "blown" or someone may have jogged one of the connections so the circuit is no longer complete. If any one of the components in the circuit is not working, the electricity will not flow.
• Question 6

Keisha decides to check the bulb by taking it out and replacing it with a device which changes electrical energy into sound.

This device is called a........

buzzer
EDDIE SAYS
Yes, when a buzzer is plugged into the circuit and electricity flows through it, it makes a really irritating buzzing sound! It's changing electricity into sound.
• Question 7

The buzzer works in the circuit. This tells Keisha that........

EDDIE SAYS
That was a key moment. Electrical energy is flowing from the battery to the buzzer to make a sound. The bulb was no longer working, which is why the circuit stopped working. Keisha needs to replace the bulb.
• Question 8

Keisha adds a switch to the circuit.

When the switch is open, the electricity........

cannot flow
EDDIE SAYS
Remember, a gap in the circuit means electricity cannot flow. That's because air does not really conduct electricity and so it blocks the flow around the circuit.
• Question 9

Choose from the list which device must Keisha use to change electrical energy into movement

a motor
EDDIE SAYS
In fact, a motor whizzes round when it's connected - that's electrical energy being changed into motion. The wheel cannot move on its own, but stick it on to the motor and it could spin round when the motor is on.
---- OR ----

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