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CIRCUIT QUESTION - SWITCHES AND

OTHER COMPONENTS

V. Ryan © 2007 - 2009

 

PDF FILE - CLICK HERE FOR PRINTABLE VERSION OF EXERCISE SHOWN BELOW

The circuit below has a motor that can only be operated when both of the push to make switches are pressed.

 
 
1. The component names are listed below. Clearly label each of the components in the circuit.
   
ANSWER

2. The component symbols that make up the circuit are shown below. Arrange them to form the circuit diagram.

ANSWER
3. What is the function of the toggle switch?  
 
 
 
   
POSSIBLE ANSWER
   

The toggle switch is the main switch to the circuit. It must be in the ‘on’ position for the circuit to work. It isolates the circuit if it is in the off position.

   
4. What is the function of the relay?
 
 
 
   
POSSIBLE ANSWER
   

The relay is a type of switch. It is the physical link between two circuits. The first circuit on the left hand side is the one with the two push to make switches. The second circuit is on the right and has the motor.

   

5. The component shown opposite is to be added to the circuit. What is it called?

NAME:  
   

ANSWER

   
DIODE
   
6. What is the function of the new component?
 
 
   
ANSWER
   

The diode will be placed in parallel to the relay and the opposite way round. When the circuit is turned off the diode will protect the other components from back emf.

   
   

7. Draw the symbol for this new component in the box .

 

 

 

   
ANSWER
   
   

8. The npn transistor shown opposite is also to be added to the circuit. Draw its symbol in the space below

 

 

 

 

ANSWER

9. In the space below complete the new circuit that incorporates the new and original components plus a resistor to protect the transistor.

POSSIBLE ANSWER
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