M4C1

Question 1

What’s the equation for current?

Answer 1

I = ΔQ/Δt
I = current (amps or A)
ΔQ = charge (C)
Δt = time (s)

Question 2

The charge of a single electron is?

Answer 2

e = -1.6x10^-19 C

Question 3

Define current

Answer 3

The rate of the flow of charge

Question 4

Whats the equation for charge?

Answer 4

Q = ne
Q = charge (C)
n = no. electrons per unit volume (m^-3)
e = charge of a single electron (C)

Question 5

What’s the unit of charge?

Answer 5

Coulomb
It’s defined as the quantity of charge that passes a fixed point in one second when a current of 1 ampere is flowing
1 C = 1 A s

Question 6

Name Kirchhoff’s first law

Answer 6

At a junction in a circuit the sum off all the current is equal to 0

Question 7

What’s the formula for electron drift velocity?

Answer 7

v = I/nAe
v = velocity (m s^-1)
I = current (A)
n = the number of free electrons per unit volume (m^-3)
A = cross sectional area (m^2)
e = the charge of a single electron (C)