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Physics > Electricity > Flashcards

Electricity Flashcards

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0
Q

What is the brown lead in a plug?

A

Live lead

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1
Q

What is double insulation?

A

2 layers of plastic to protect you from high voltage mains

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2
Q

What does the fuse do?

A

Melts if the current passing through is too big, it breaks the circuit

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3
Q

What is the green and yellow lead?

A

Earth wire

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4
Q

What is the blue lead?

A

The neutral pin

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5
Q

What does the earth wire protect you from?

A

Electrocution

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6
Q

What happens when there’s a greater current flowing through a wire?

A

It becomes hotter, moving electrons transfer energy to fixed metal atoms

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7
Q

What is one watt? _____per______

A

1 joule per second

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8
Q

What is one amp? _____per____

A

1 coulomb per second

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9
Q

What is 1 volt? ____per____

A

Joule per coulomb

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10
Q

In a series circuit what is the current like?

A

Same at all points

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11
Q

What is the voltage like in a series circuit?

A

Shared between components

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12
Q

What is the voltage like in parallel?

A

Same across each branch

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13
Q

What’s does the current do in parallel?

A

Divides

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14
Q

Where are ammeters connected?

A

In series

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15
Q

Where are voltmeters connected?

A

In parallel with a component

16
Q

What is the relationship between current and voltage in a resistor?

A

Directly proportional

17
Q

What is the relationship between current and voltage in a filament bulb?

A

As the current increases the bulb heats up. Resistance increases so the graph flattens out after a while

18
Q

What is the relationship between current and voltage in a diode?

A

No current when voltage is negative, in positive direction, current increases

19
Q

What is voltage?

A

Energy transferred per unit charge passed

20
Q

What can be charged by friction?

A

Insulators

21
Q

When can electrostatics be used?

A

Painting, negative charge in paint attracted to positive charge on car
Photocopying

Physics (9 decks)

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