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Questions on Electric Circuits

Q9. Pressure pads can be used to set off burglar alarms. The alarm is set off when someone steps on the pad. The alarm works by sounding a buzzer or switching on a lamp or both.

The symbols for a pressure pad is:

Here are five circuit diagrams. Look carefully at the five circuit diagrams.

Tick the correct box in the table below to show what is happening in each circuit.

Circuit Diagram
The buzzer is on and the lamp is off
The lamp is on and the buzzer is off
Both the buzzer and the lamp are on
The buzzer and the lamp are both off
A
        
B
        
C
        
D
        
E
        

5 marks