Electric current

Question 1

Why doesn’t movement of delocalised electrons in conductor result in current?

Answer 1

As many electrons move in one direction as in the other

Question 2

What happens when an electric field is applied across a conductor?

Answer 2

Delocalised electrons experience a force, pushing them opposite to the direction of the field, producing d.c

This is because of repulsion: electrons are -ve

Question 3

Direct current

Answer 3

Electrons move in the same direction with the same average drift speed

Question 4

Alternating current

Answer 4

Electrons oscillate instead of moving in one direction with the same drift speed

Question 5

Formula for current when given charge

Answer 5

I = Δq/Δt
I= nAvq

Question 6

Drift speed

Answer 6

Average speed of electrons in direction opposite to electric field