Data Sheet

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78. Circuit Breakers
In this circuit, if you want to turn on the two LEDs, you need to turn
on all the switches at the same time. This circuit could represent your
house circuitry. Think of the reed switch (83) like the circuit breaker in
your house, the switch (62) like a wall switch, and the press switch (61)
like the switch on an appliance plugged into the outlet controlled by the
switch (62). Even if you turn on the wall switch and the switch on the
appliance, if you trip a fuse in the circuit breaker for that room in your
house (simulated by moving the magnet (7) away from the reed switch
(83)), then the appliance will not turn on.
79. Reed Switches in Laptops
Build the circuit shown on the left. If you turn on any one of the switches,
you can see the two LEDs are on at the same time. But if you want to
turn off the LEDs, you need to turn off all the switches.
Did you know that reed switches like the one in this circuit are used in
some laptops to put the laptop in sleep/hibernation mode when the lid
is closed?
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1st level