# Component 2 - Conduction of Electricity

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What is the law of conservation of charge?
Net charge in a system remains constant (provided charges can't enter or leave).
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What is an electrical conductor?
A material through which a charge can flow.
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What is neutralisation due to?
Redistribution of free electrons .
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What is electric current?
Rate of flow of charge.
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What is the unit of current?
Amperes, Cs ^-1
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What is the formula linking current and charge?
Q = It
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Which way is the free electron drift velocity in relation to the conventional current?
It is in the opposite direction.
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What is the charge on an electron?
1.6 x 10 ^-19 C
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Why is current equal round a circuit?
I1 = I2 = I3 because any free electrons would repel one another, and so there cannot be a build up of electrons.
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How do you read the total charge off a current - time graph?
Take the area under the graph.
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What is the formula which, when rearranged, gives the electron drift velocity?
I = nAve
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Is charge a scalar or vector?
Scalar.
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What is an ammeter?
An instrument for measuring current.
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## Other cards in this set

### Card 2

#### Front

What is an electrical conductor?

#### Back

A material through which a charge can flow.

### Card 3

#### Front

What is neutralisation due to?

### Card 4

#### Front

What is electric current?

### Card 5

#### Front

What is the unit of current?