How a torch works

How a torch works

Pencil and paper
Overview
Connecting to the Curriculum
Marking Student Responses
 
a)  The diagram above represents a torch. 
     Complete the table by explaining the function of the different parts of the torch.
 
PART FUNCTION
CELL      
METAL CONE      
METAL STRIP      
SPRING  
SWITCH  

b)  Using standard symbols, draw a circuit diagram to show how this torch works.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Level:
5
Curriculum info: 
Science, Communicating in science, Physical World
Keywords: 
using physics, electricity, circuits, torches, diagrams, symbols
Description of task: 
Using a diagram of a torch, students explain the function of the following parts; cell, metal cone, metal strip, spring, and switch. Students also draw a circuit diagram for the torch.
Curriculum Links: 
Science capabilities
The capabilities focus is brought about by the conversations you have and the questions you ask.
 
Capability: Interpret representations
This resource provides opportunities to discuss circuit diagrams use a particular agreed code for the different elements.
 
 
Science capabilities: 
Interpret representations
Answers/responses: 
 

Y10 (06/2001)
  • Cell – makes electricity/energy source (or any similar answer).
  • Metal cone – to reflect/direct light (out of torch).
  • Metal strip – to complete the circuit (for electricity to flow).
  • Spring – to make sure there are good contacts/keep batteries connected or firmly in place.
  • Switch – to break the circuit to turn lamp off/to connect the circuit (or any similar answer).

[NOTE: do not accept "turns the torch on and off"].

easy
easy
difficult
moderate
 
difficult

  • A lamp with correct symbol drawn.
  • A switch with correct symbol drawn.
  • 2 cells with correct symbol drawn.
  • A series circuit is drawn.

 

 

 

moderate
moderate
difficult
moderate