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physics
electricity
Fuses & Earthing
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Created by
Khalisa
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Cards (35)
What is a common problem when dealing with electricity?
Sudden increases in
current
, called
surges
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What can cause surges in electrical circuits?
Changes
in a
circuit
or
faults
in
appliances
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What are the potential dangers of electrical surges?
Fires
or electric
shocks
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What safety precautions can reduce risks from electrical surges?
Fuses
Circuit breakers
Earth wires
Double insulation
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How do fuses and circuit breakers function similarly?
They both break the circuit during
surges
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What is a fuse made of?
A very
thin
piece of wire
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What happens to a fuse during a surge?
It melts and
breaks the circuit
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What do fuses come in?
A range of different
ratings
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If an appliance has a normal current of 3 amps, which fuse could be used?
A
5 amp
fuse
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What is a downside of using fuses?
They are permanently broken after a
surge
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How do circuit breakers differ from fuses?
They can be reset after
tripping
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How can surges cause harm in appliances?
If the
live wire
touches the casing
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What is a disadvantage of circuit breakers compared to fuses?
They are more
expensive
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What is the purpose of earthing in electrical safety?
To provide an
alternative pathway
for current
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How does double insulation prevent electric shocks?
It covers the appliance in
plastic casing
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What type of wire does a double insulated appliance have?
Only
live
and
neutral
wires
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What is the general rule for appliances with double insulation?
They do not need an
earth wire
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What is the main function of a fuse?
To
break
the
circuit
during a
surge
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What happens to the fuse wire during a surge?
It heats up and
melts
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Why might someone choose a circuit breaker over a fuse?
Because circuit breakers can be
reset
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What is the role of the earth wire?
To divert
electricity
away from users
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If an appliance requires a 10 amp fuse, which fuse should be used?
A
13
amp fuse
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What does double insulation prevent?
Electric shocks
from
exposed metal parts
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What is the main benefit of using fuses?
They are simple and
cheap
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How does the function of a fuse compare to that of a circuit breaker?
Fuses
melt
, while circuit breakers
reset
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What should you do if a circuit breaker trips?
Reset
it to restore the circuit
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What is the purpose of the live wire in an appliance?
To carry
current
to the appliance
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What happens if a person touches a live appliance casing?
They can receive a big electric shock
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How does earthing protect users from electric shocks?
It provides a safe path for
excess current
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Why is plastic used in double insulation?
Because plastic does not
conduct electricity
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What is the main function of an earth wire?
To provide a path for
current
to
ground
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What is the relationship between double insulation and the need for an earth wire?
Double
insulated
appliances do not need an
earth wire
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What is the purpose of circuit breakers?
To break the circuit during a
surge
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What happens to a circuit when a fuse blows?
The
circuit
is
broken
and
current
stops
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How do fuses and circuit breakers contribute to electrical safety?
They prevent
excessive
current from causing harm
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