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A Torch and How it Works

The worksheet investigates the workings of a torch.

'A Torch and How it Works' worksheet

Key stage:  KS 2

Curriculum topic:  Electricity

Curriculum subtopic:  Variations in Functions of Components

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

This worksheet tests your knowledge of how a torch works.

A battery operated torch is an example of a simple circuit.

 

Most torches use metal strips within the circuit, instead of wires.

Look at this diagram of a torch. How many cells are there in the torch?

1 cell

2 cells

3 cells

Look at this diagram of a torch. As drawn, is the switch on or off?

on

off

Why is there a metal spring in the torch?

To make it easier to remove the cells from the torch.

To keep the cells close to each other so they make a good contact.

To stop the cells from bouncing around in the torch and making noise.

Some torches have to have a case made of metal, or they do not work. Why is this?

The case protects the torch better than plastic.

The metal case helps the torch to work underwater.

The case acts as one of the wires in the circuit.

Each cell in this torch can deliver 1.5 volts. What voltage does the bulb require to glow normally?

zero volts

1.5 volts

3 volts

4.5 volts

  • Question 1

Look at this diagram of a torch. How many cells are there in the torch?

CORRECT ANSWER
2 cells
EDDIE SAYS
There are two C-sized cells shown in the diagram.
  • Question 2

Look at this diagram of a torch. As drawn, is the switch on or off?

CORRECT ANSWER
off
EDDIE SAYS
The switch is not touching the copper strips together. The copper strips act as wires in the torch.
  • Question 3

Why is there a metal spring in the torch?

CORRECT ANSWER
To keep the cells close to each other so they make a good contact.
EDDIE SAYS
The cells are heavy and can easily come away from the back of the bulb. The spring keeps the cells touching each other.
  • Question 4

Some torches have to have a case made of metal, or they do not work. Why is this?

CORRECT ANSWER
The case acts as one of the wires in the circuit.
EDDIE SAYS
In metal cased torches the case is used as one of the wires. Electricity cannot travel through plastic.
  • Question 5

Each cell in this torch can deliver 1.5 volts. What voltage does the bulb require to glow normally?

CORRECT ANSWER
3 volts
EDDIE SAYS
Each cell supplies 1.5V so the bulb receives a total of 3V and will glow normally. If less voltage is supplied the bulb will be dimmer or it might not light at all. If too much voltage is supplied then the bulb could break.
---- OR ----

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