A variable is a factor that can be changed in an investigation.

A component is a device in a circuit that has a specific function.

To predict is to say what you think will happen.

A buzzer is a device in an electrical circuit which makes a noise.

A decibel is a unit used to measure the volume of sound.

Changing the volume of buzzers

Science

In the Changing circuits unit, pupils learnt to give reasons for variations in how components function, such as the brightness of bulbs. In the Series circuits unit, they will build on this knowledge to find rules for electric current and voltage in series circuits 

In the Simple electrical circuits units, pupils learnt to construct a simple series electrical circuit, identifying and naming its basic parts. In this Changing circuits unit, pupils will build on this knowledge to compare and give reasons for variations in how components in a circuit function

This unit explores how circuit components like lamps and buzzers function, including the effect of cell number and voltage. It covers using symbols in circuit diagrams, planning scientific enquiries, taking precise measurements, recording data, and presenting findings with evidence and conclusions.

Changing circuits

Physical activity and equipment requiring safe use

__________ the number and voltage of batteries increases the electrical push they provide. 

the diagrams from previous investigations 

the results from previous investigations 

the equipment from previous investigations

What can scientists use to help them make prediction?

Does this data support the prediction that adding cells to a circuit makes a motor spin faster?

Sensors and data __________ can be used to make and record accurate measurements of light and sound.  

Scientists evaluate __________ to compare what was expected to what actually happened.

Why won’t electricity flow around this circuit?  

Attach the bulb to the other components. 

Which of these does not affect the brightness of a bulb in a circuit? 

The positive terminal of a {{}} has to be connected to the positive terminal of the cell or battery for it to work.

Which of these would cause a bulb to get dimmer? 

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet