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Physics > electricity - fuses > Flashcards

electricity - fuses Flashcards

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1
Q

what is a fuse connected to?

A

the live pin of a 3 pin plug

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2
Q

what is a fuse?

A

a weak link in the circuit which prevents the appliance from overheating if too much current flows. The fuse melts (blows) cutting of the current making it safe

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3
Q

what happens if a large electrical current flows through a piece of wire?

A

the wire will heat up and glow

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4
Q

what happens when to much current flows through the wire?

A

the wire will melt

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5
Q

what type of appliances have an Earth wire?

A

appliances with metal casings

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6
Q

what does RCCB stand for?

A

residual current circuit breaker

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7
Q

what are the advantages of RCCBs?

A

they are more sensitive than a wire fuse
they cut the current more quickly than a wire fuse
they are easy to reset
they can be used where there is not Earth connection

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8
Q

what is the equation for power, with energy and time?

A

power = energy/time

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9
Q

is house wiring in series or parallel

A

parallel

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10
Q

why is house wiring is parallel?

A

so all sockets do not need to be turned on to work

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11
Q

what is the equation for power, current and potential difference?

A

power = current x potential difference

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12
Q

what is the power, current and resistance?

A

power = current2 - squared - x resistance

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13
Q

what colour is the live wire

A

brown

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14
Q

what does a live wire do

A

carries current to the appliance

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15
Q

what colour is the neutral wire

A

blue

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16
Q

what does the neutral wire do

A

carries current away from appliance

17
Q

what colour is the earth wire

A

green and yellow stripes

18
Q

what does the earth wire do

A

provides a low resistance path to the ground

19
Q

what happens when the plug is in use

A

the potential difference causes current to flow through the live and neutral wires
the live wire carries the alternating potential from the supply
the neutral wire completes the circuit
current will only flow in the earth wire if there is a fault conneting it to a non zero potential

Physics (6 decks)

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