Switches
Switching on the radio
Switching on a light by a wall switch
Switching on the cooker
Switching on a computer
Switching on an electric toothbrush
Switching on a TV
Switching on a light by a pull cord
These are just a few of the uses of
switches in your homes.
There are many different ways in which a switch
can be turned on or off. Here are some of them:
(a) person – light switch
(b) light
– street lights
(c) infra red beam - TV or stereo remote control
(d) movement –
security light
(e) heat – security light
(f) sound – controls for disabled people
(g)
electronic – turning off a computer by clicking the mouse
(h) touch – touch sensitive table
lamp
(i) ultrasonic beam – car reversing impact warning
(j) pressure – seat belt
warning light
Think about the different sorts of switches in your home
(a)
ordinary ON-OFF switch
(b) dimmer switch – use it to turn lights on and off and control
how bright they are
(c) timer switch – it goes off after a certain time controlled by
electronics or a spring
These switches all control electricity but what about a
water tap, that is a kind of switch but this time it controls not electricity but water.
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