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Physics > 4.1 - Electricity: charge and current > Flashcards

4.1 - Electricity: charge and current Flashcards

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1
Q

What is a charge carrier?

A

A charged particle capable of transferring electric current

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2
Q

What do we mean when we say charge is quantised?

A

It can only take certain values (always ne)

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3
Q

If n electrons are removed from a neutral object what is its charge?

A

-ne, positive

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4
Q

What is an electrolyte?

A

A liquid containing charged ions

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5
Q

What is a metallic conductor?

A

A material comprising a lattice of positive ions and delocalised electrons that carry electrical current

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6
Q

Which direction does conventional current flow?

A

from positive to negative

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7
Q

Which direction do electrons flow in a circuit?

A

From negative to positive

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8
Q

What is an ion?

A

A non-neutral atom or molecule

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9
Q

what is a cation?

A

A positively charged ion

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10
Q

what is an anion?

A

a negatively charged ion

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11
Q

What is an anode?

A

a positive electrode

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12
Q

What is a cathode?

A

a negative electrode

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13
Q

how is an ammeter connected?

A

In series

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14
Q

What is the resistance of an ideal ammeter?

A

Zero

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15
Q

State Kirchoff’s first law

A

At any point in a circuit the sum of the currents entering that point is equal to the sum of the currents leaving

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16
Q

What is n in the equation I=nAve and what are its units?

A

Number density of free charge carriers m^-3

17
Q

What is A in the equation I=nAve?

A

cross sectional area of the conductor

18
Q

What is e in the equation I=nAve?

A

The elementary charge (1.6*10^-19C)

19
Q

What is v in the equation I=nAve?

A

The drift velocity of the charge carriers

20
Q

What is a conductor?

A

A material with a large number density of charge carriers ~10^28m^-3

21
Q

What is an insulator?

A

A material with a low number density of charge carriers

22
Q

What is a semiconductor?

A

A material with an intermediate number density of charge carriers ~10^17m^-3

Physics (13 decks)

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