Buzzers and beepers


A buzzer or beeper changes electrical energy into sound energy. You must connect the positive terminal of a buzzer to the positive terminal of the cell or battery. The voltage of most buzzers is printed on them. Check the voltage of your buzzer before you connect it to a battery. If the battery has a higher voltage than the buzzer, you can protect the buzzer from burning out by connecting a resistor in series with it.


Buzzers are used in door bells and electronic games. Beepers are used in microwave oven timers, alarms in watches, cellphones and clocks.


Figure 3 A buzzer changes electrical energy into sound energy.


Motors


A motor changes electrical energy into movement energy. Most motors use the magnetic effects of current to make the motor turn. Motors are used in the complex circuits of appliances such as fans, pumps, washing machines and food mixers.


Figure 4 Beepers are used in alarm clocks.


Figure 5 A motor changes electrical energy into movement energy. A fan moves air to keep us cool.


Washing machines are used to clean our clothing.


Unit 2 Output devices in complex circuits 125


STRAND 3


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