P2.5 Mains electricty Flashcards

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1
Q

What is a fuse?

A

A thin wire which is used as a safety device as it melts if too much current passes through it breaking the circuit

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2
Q

What is a fuse’s amp rating?

A

The largest current that can pass through it

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3
Q

What are the two types of fuse?

A

1) Cartridge

2) Rewirable

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4
Q

What is a circuit breaker and what does it do?

A
  • Electromagnet switch

- Cuts the circuit when too much current passes through it

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5
Q

What does RCCB stand for?

A

Residual current circuit breaker

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6
Q

What does an RCCB do?

A

It detects differences between current in the live and neutral wires

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7
Q

Why is an RCCB good?

A
  • It is fast

- It is more sensitive

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8
Q

What is the equation for energy transferred?

A

Energy transferred (J) = potential difference (V) x charge (coulombs)

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9
Q

Define potential difference

A

The difference in electrical energy between two points.

Amount of energy carried by each charge

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10
Q

Define alternating current

A

The voltage alternates from positive to negative charges

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11
Q

Define frequency

A

The number of cycles one way and then the other per second

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12
Q

What is the equation for peak voltage

A

Peak voltage = divisions x timebase (y gain)

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13
Q

What is the blue cable in a plug ad where does it go?

A

It is neutral and it goes on the left

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14
Q

What is the striped (green and yellow) cable in a plug and where does it go?

A

It is the earth cable and it goes at the top

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15
Q

What is the brown cable in a plug and where does it go?

A

It is the live cable and it goes on the right

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16
Q

Why are the pins on a plug made from brass rather than copper?

A

Because it conducts electricity but it is stronger than copper

17
Q

Why is the case on a plug made from plastic?

A

Because it insulates the plug and separates the wires

18
Q

What does the green cable actually do?

A

It carries electricity to the ground if there is a problem

19
Q

What does the blue cable actually do?

A

It completes the circuit

20
Q

What does the brown cable actually do?

A

It shocks you if touched (carries all the current)