Manual

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52. Circuit Breaker
Build the circuit, rst press the switch (62), then move the
magnet (7) towards the reed switch (83); you will hear the
alarm (78) sound very faintly. The LED (69) will turn on at the
same time. If you move the magnet (7) away the alarm (78)
and LED (69) will turn off. You can think of the reed switch
(83) in this circuit like the circuit breaker in your house. If
something draws too much current in your house, then the
circuit breaker trips, like moving the magnet (7) away from
the reed switch (83), and none of the switches in parts of
your house will work until you reset the circuit breaker, which
is like putting the magnet back on the reed switch (83).
53. Power Outage
Build the circuit, press the switch (62), then hold the press
switch (61). Now move the magnet (7) towards the reed
switch (83), the alarm (78) will sound very faintly while the
LED (69) turns on. If you release the press switch (61) or
move the magnet (7) away, both the alarm (78) and LED (69)
turn off.
Think of the reed switch (83) as the power plant in your city,
the switch (62) like the circuit breaker in your house, and
the press switch (61) like a light in your house. Even if your
house light switch and circuit breakers are on in your house,
if there is a power outage, simulated by moving the magnet
(7) away from the reed switch (83), the devices in your house
will not activate.