Electric Current

Question 1

Charge carrier meaning

Answer 1

A charged particle that contributes to an electrical current; either electrons, portons or ions

Question 2

Quantised meaning

Answer 2

A quantity is said to be quantised when it has a definite minimum magnitude and always comes in multiples of that magnitude

Question 3

Current meaning

Answer 3

The rate of flow of electric charge past a point

Question 4

Ampere meaning

Answer 4

the SI unit of electric current abbreviated to A

Question 5

Coulomb meaning

Answer 5

one coulomb is the charge that flows pat a point in a circuit in a time of 1 second when the current is 1 A abbreviated to C

Question 6

Charge equation

Answer 6

∆Q = I∆t

charge = current x time

Question 7

Elementary charge meaning

Answer 7

e = 1.6 x 10⁻¹⁹C

Question 8

Number density meaning

Answer 8

the number of charge carriers per unit volume in a material

Question 9

Mean drift velocity meaning

Answer 9

the average speed of a collection of charged particles when there is current in a conductor

Question 10

Current equation

Answer 10

I = Anqv

Question 11

Potential difference definition

Answer 11

the potential difference (V), between 2 points is the energy transferred per unit charge as it moves from one point to the other

Question 12

Voltage equation

Answer 12

V = ∆W/∆Q

Question 13

Emf definition

Answer 13

the energy transferred per unit charge in driving charge around a complete circuit

Question 14

Electrical resistance definition

Answer 14

the ratio of potential difference to current (ohm)

Question 15

Resistance equation

Answer 15

R = V/I

resistance = potential difference / current

Question 16

Ohm meaning

Answer 16

the ohm is the resistance of a component when a pd of 1V drives a current of 1A through it

Question 17

Power equations x3

Answer 17

P = VI
P = I²R
P = V²/R