Current, charge and potential difference

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Describe in words and symbols how current and charge are related.
Q = It. Current is the rate of flow of charge.
1 of 6
Explain what is meant by the sentence 'charge is quantised'.
It will always be a multiple of e (the elementary charge).
2 of 6
Define potential difference.
The work done per unit charge. V = W/Q.
3 of 6
Write an equation for the velocity of an electron accelerated by a p.d. of V, in terms of its charge and mass.
v^2 = 2eV/m (as eV equals kinetic energy).
4 of 6
What happens to the current in a wire if the mean drift velocity of the electrons is halved?
It is halved.
5 of 6
Describe how metals, semiconductors and insulators differ in terms of n.
Metals have a high n value, semiconductors have a lower n value and insulators have an n value close to zero.
6 of 6

Other cards in this set

Card 2

Front

Explain what is meant by the sentence 'charge is quantised'.

Back

It will always be a multiple of e (the elementary charge).

Card 3

Front

Define potential difference.

Back

Preview of the front of card 3

Card 4

Front

Write an equation for the velocity of an electron accelerated by a p.d. of V, in terms of its charge and mass.

Back

Preview of the front of card 4

Card 5

Front

What happens to the current in a wire if the mean drift velocity of the electrons is halved?

Back

Preview of the front of card 5
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