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Physics > Electrcity > Flashcards

Electrcity Flashcards

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1
Q

How many watts are in a megawatt

A

one million watts

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2
Q

how many watts are in a gigawatt

A

One billion watts

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3
Q

from what end of the cell does current flow from

A

negative (to positive)

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4
Q

The current ina series circuit is _____

A

the same

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5
Q

The current in a parallel circuit _____ to the total ____ ________ ____ ______

A

the current in parallel circuit sums to the total current leaving the cell

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6
Q

3 stages of the national grid

A

step-up transformer, high voltage cables, step down transformer

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7
Q

How does the national grid work?

A

Electricity passes through step up transformers which increase the potential difference to several hundred volts.

Electricity then passes through high voltage cables but cannot be passed onto homes yet as potential different would be far too high

Electricity passes through the step-down transformers which redue the potential difference to 230V

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8
Q

DC

A

direct current

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9
Q

AC

A

alternating current

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10
Q

What is DC

A

electrons only travel in one direction

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11
Q

What is AC

A

electrons that are constantly changing direction

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12
Q

Benefit of AC?

A

Very easy to use a transformer to increase or decrease the potential difference

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13
Q

Frequency of AC in the UK

A

50 hz

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14
Q

potential difference of AC in the UK?

A

230 voltage

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15
Q

Potentiall difference does/does not change in DC

A

does NOT

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16
Q

What is the wire + casing made of in the 3 core cable?

A

wire = copper
casing = plastic

17
Q

What is the brown wire?

A

Live wire

18
Q

What is the purpose of the live wire?

A

Carries alternating potential difference from the supply (230V) connected to a fuse in the plug

19
Q

What is the Blue wire?

A

Neutral wire

20
Q

What is the purpose of the neutral wire?

A

completes circuit, potential difference = 0V

21
Q

What is the green/yellow wire?

A

Earth wire

22
Q

What is the purpose of the earth wire

A

safety wire to stop appliance from becoming live (having voltage)

23
Q

Why are appliances with metal casings dangerous?

A

If the live wire becomes loose, the metal casing could become live too, and if someone were to touch the live metal casing they would be elctrocuted and die

24
Q

How does the earth wire solve the porblem of live wires and metal casings?

A

Earth wire is attatched to metal case and ground so if the case becomes live, the current flows to the earth

25
Q
A

Physics (6 decks)

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