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A light bulb changes electrical energy into light energy.

Electrical Circuits 01

Electrical circuits show how electricity flows. In KS3 Science, pupils discover how components connect, how current moves, and why circuits must be complete to work.

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Fascinating Fact:

Metals such as copper are good conductors because electrons move through them easily.

In KS3 Science, electrical circuits are studied to understand how current travels, how voltage affects components, and why conductors and insulators behave differently in a circuit.

Key Terms

Current: The flow of electric charge through a circuit, measured in amperes.
Voltage: The electrical push that drives current around a circuit, measured in volts.
Conductor: A material, like copper, that allows electricity to flow easily through it.

Frequently Asked Questions (Click to see answers)

What is an electrical circuit in KS3 Science?

An electrical circuit is a closed loop of wires and components where electricity flows. It must be complete for current to move around it.

What materials are good conductors of electricity?

Metals such as copper, aluminium, and gold are good conductors because they allow electrons to pass through them easily.

Why does a circuit need to be complete?

A circuit needs to be complete so that current can flow continuously from the power source, through the components, and back again without interruption.

Try These Related Quizzes

1 .

In order to measure the current flowing through a bulb in a circuit, the ammeter is connected in:

Not connected in the circuit

parallel with the battery

parallel with the bulb

series with the bulb

It measures the amount of electricity flowing through the circuit or component and therefore needs to be in the circuit rather than being in parallel with it

2 .

What is the unit of electric current?

Amp

Ohm

Volt

Watt

Short for ampere

3 .

Three bulbs connected in series:

are brighter than one bulb

are dimmer than one bulb on its own

do not light up

are the same brightness as one bulb

The energy of the cell is shared between them

4 .

In order to measure the voltage across a bulb in a circuit, the voltmeter is connected in:

Not connected in the circuit

parallel with the battery

parallel with the bulb

series with the bulb

The clue is in the wording - you measure voltage across a component

5 .

If more bulbs are added in series in a series circuit:

less current flows

more current flows

no current flows

there is no change in current flow

It is the voltage from the battery or power pack that pushes the current round a circuit. As more bulbs are added to a circuit, it is harder for the battery or power pack to push the current round the circuit. This means that less current flows (so the bulbs would be dimmer than before). To make more current flow you would need to use a higher voltage. To make no current flow, you would need to break the circuit by disconnecting a wire. To keep the current the same as before, you would need to increase the voltage to compensate for the extra bulbs

6 .

What does an electric circuit need to provide energy?

A bulb

A cell

A switch

A wire

A battery contains two or more cells

7 .

What is used to measure the flow of current in a circuit?

Ammeter

Battery

Rheostat

Voltmeter

Most school ammeters are now digital which makes them easier and faster to read

8 .

Which of the following does a light bulb do?

Change electrical energy into kinetic energy

Change electrical energy into light energy

Change light energy into electrical energy

Change light energy into thermal energy

Thomas Edison invented a light bulb that stayed alight. All the previous efforts had only stayed alight for a short while before the filament melted, breaking the circuit

9 .

A complete circuit has:

a motor in it

a switch in it

two bulbs in it

no breaks in it

Switches are used to deliberately break a circuit so that the electricity doesn't flow round it all the time

10 .

In a parallel circuit:

the current can flow through only one route

the current can flow through more than one route

the current does not flow

the current gets smaller

The current splits at a junction in the wires

You can find more about this topic by visiting BBC Bitesize - Models of electrical circuits

Author: Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)

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