TOPIC 14: CURRENT OF ELECTRICITY

Question 1

[Definition] Electric Current

Answer 1

Electric current is the rate of flow of charge.

Question 2

Is current a scalar or vector quantity?

Answer 2

Scalar

Question 3

[Formula] Electric Current

Answer 3

1. I = dQ / dt

For constant current, I = Q / t

2. I = nAvq
   n = number density of charge carriers
   A = cross sectional area
   V = drift velocity
   q = charge

Question 4

What can charged carriers / charged particles refer to?

Answer 4

Electrons / protons / ions

Question 5

What causes resistance in objects?

Answer 5

When the electrons collide with the lattice of cations or amongst themselves

Question 6

What is the average drift velocity

Answer 6

Around 10^-4 ms^-2