8.1-8.4 Charge and Current Quizlet Cards Flashcards Preview

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Flashcards in 8.1-8.4 Charge and Current Quizlet Cards Deck (22)
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1

What is a charge carrier?

A charged particle capable of transferring electric current.

2

What do we mean when we say charge is quantised?

It can only take certain values (always ne)

3

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

+ne

4

What is an electrolyte?

A liquid containing charged ions.

5

What is a metallic conductor?

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

6

Which direction does conventional current flow?

From positive to negative.

7

Which direction do electrons flow in a circuit?

From negative to positive.

8

What is an ion?

A non-neutral atom or molecule.

9

What is a cation?

A positively charged ion

10

What is an anion?

A negatively charged ion.

11

What is an anode?

A positive electrode.

12

What is a cathode?

A negative electrode.

13

How is an ammeter connected?

In series

14

What is the resistance of an ideal ammeter?

Zero.

15

State Kirchoff's first law.

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

16

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

Number density of free charge carriers m⁻³

17

What is A in the equation I = nAve?

Cross-sectional area of the conductor.

18

What is e in the equation I = nAve?

The elementary charge (1.6x10⁻¹⁹C)

19

What is v in the equation I = nAve?

The drift velocity of the charge carriers.

20

What is a conductor?

A material with a large number density of charge carriers ~10²⁸m⁻³

21

What is an insulator?

A material with a low number density of charge carriers.

22

What is a semiconductor?

A material with an intermediate number density of charge carriers ~10¹⁷m⁻³