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Cards (8)
Relay
A device that contains two separate circuits - a
low-voltage
circuit with an electromagnet, and a high-voltage circuit with metal contacts that are kept apart by a
spring
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How a relay works
1.
Low-voltage
circuit is turned on, creating a
magnetic field
in the electromagnet
2.
Magnetic field
attracts the
iron
block, causing the high-voltage contacts to close
3.
High-voltage circuit
is now switched on
4. When
low-voltage circuit
is turned off, no
magnetic field
, contacts spring apart, high-voltage circuit is switched off
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Electric doorbell
A device that uses an electromagnet to make a
clapper
hit a bell when the
doorbell
is pressed
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How an electric doorbell works
1. Switch is
closed
when doorbell is
pressed
2. Current flows through
circuit
, creating a
magnetic field
in the electromagnet
3. Magnetic field attracts the
iron contact
, causing the
clapper
to hit the bell
4. This
breaks
the circuit, stopping the current flow, and the iron contact springs back to its
original
position
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Circuits using
high-voltage
switches can be dangerous, with risks of sparking and
electrocution
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Relays and electric doorbells use
electromagnets
to switch on and
off high-voltage
circuits in a safe way
View source
A
moving
charge produces an electric current, which generates a
magnetic
field around it.
Electric charges can be positive or
negative
, while electric current is always considered as flowing from positive to
negative.
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