# Building Circuits 3

In this worksheet, students will answer questions about what happens when the components in a simple battery circuit are changed.

Key stage:  KS 2

Curriculum topic:   Electricity

Curriculum subtopic:   Simple Circuits

Difficulty level:

### QUESTION 1 of 10

Electrical energy travels around a simple battery circuit from the battery to the device - a buzzer, bulb or motor. If the electrical energy in the circuit is too strong, it can damage the device. For example, a bulb may 'blow'. This means that the bulb will no longer work.

Simple circuits could look like this:

Bulbs may also glow very brightly because a lot of energy is being turned into light and heat.

If the electrical energy is not enough to power the device(s) in the circuit, we will also see the effects. For example, bulbs may be dim, or not produce any light at all.

The length of the wires in the circuit can also affect the brightness of the bulb. Very long wires make the bulb dim.

Use that information to help you as you circulate through the questions in this worksheet.

Hafis and Shelly make a circuit by connecting a battery to a bulb. The bulb lights.

Which one of these will make the bulb brighter

Hafis says: "If we increase the length of the wires, the bulb will be dimmer."

Shelly says: "If we increase the length of the wires it will not change the brightness of the bulb."

Who do you think is correct?

Hafis

Shelly

Shelly wants to add another bulb to their circuit, so that it has one battery and two bulbs. They record what they think will happen.

This is called....

a preview

an investigation

a prediction

They add the bulb to their circuit.

What will happen to the brightness of the two bulbs?

they will be dimmer

they will be brighter

they will stay the same

They change their circuit again. Shelly uses one bulb and two batteries.

Which statement BEST describes the brightness of the bulb?

bright

very bright

dim

Hafis wants to find out what will happen to the bulb if another battery is added to the circuit.

Which one of these predictions is the best?

the bulb will burn out

the bulb will be very bright

there will be no change

Shelly and Hafis build a circuit with one bulb and one battery. The bulb glows.

Shelly adds a motor to this circuit. Now the bulb does not glow and the motor does not work.

What is the best way to get the motor working?

plug into the mains

connect another motor

connect another battery

Eventually batteries stop supplying electricity.

What is the best explanation for this?

all their energy has been transferred

they get worn out

they are empty

Shelly says: "It's much better to use rechargeable batteries because then we do not have to throw them away."

What does Shelly mean by rechargeable?

you pay twice for them

they can be 're-filled' with energy

they always work

• Question 1

Hafis and Shelly make a circuit by connecting a battery to a bulb. The bulb lights.

Which one of these will make the bulb brighter

EDDIE SAYS
More electrical energy, provided by two batteries, will increase the brightness of the bulb.
• Question 2

Hafis says: "If we increase the length of the wires, the bulb will be dimmer."

Shelly says: "If we increase the length of the wires it will not change the brightness of the bulb."

Who do you think is correct?

Hafis
EDDIE SAYS
Increasing the distance the electrical energy has to travel from its source to the device reduces its power.
• Question 3

Shelly wants to add another bulb to their circuit, so that it has one battery and two bulbs. They record what they think will happen.

This is called....

a prediction
EDDIE SAYS
Scientists investigate what they think will happen - they make predictions based on what they already know.
• Question 4

They add the bulb to their circuit.

What will happen to the brightness of the two bulbs?

they will be dimmer
EDDIE SAYS
The electrical energy from one battery is shared between two bulbs, making each one dimmer.
• Question 5

They change their circuit again. Shelly uses one bulb and two batteries.

Which statement BEST describes the brightness of the bulb?

very bright
EDDIE SAYS
The greater the electrical energy, the brighter the bulb.
• Question 6

Hafis wants to find out what will happen to the bulb if another battery is added to the circuit.

Which one of these predictions is the best?

the bulb will burn out
EDDIE SAYS
Too much electricity travelling through the bulb will make it burn out. The little filament inside the bulb melts and breaks the circuit.
• Question 7

Shelly and Hafis build a circuit with one bulb and one battery. The bulb glows.

Shelly adds a motor to this circuit. Now the bulb does not glow and the motor does not work.

What is the best way to get the motor working?

connect another battery
EDDIE SAYS
If there is not enough energy, the devices will not work. This explains why large kitchen appliances work on mains electricity because it is VERY POWERFUL. We MUST NEVER USE MAINS ELECTRICITY in our investigations - you might get a shock or you might end up in hospital!
• Question 8

Eventually batteries stop supplying electricity.

What is the best explanation for this?

all their energy has been transferred
EDDIE SAYS
When a battery is 'dead' it means that all the energy stored in it has been used in makiing bulbs light, motors whirr and buzzers buzz. Once all its energy has been transferred to these components it has no more left.
• Question 9

Shelly says: "It's much better to use rechargeable batteries because then we do not have to throw them away."

What does Shelly mean by rechargeable?

they can be 're-filled' with energy
EDDIE SAYS
Today, we can use batteries which can be charged-up from the mains. We do not have to throw them away - although dead batteries can be recycled at your local supermarket. Re-chargeable batteries are the GREENER alternative!
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