Electricity

Question 1

What is Electrical Current?

Answer 1

The rate of flow of positive charge carriers. It is measured in units of amperes (A) or amps

Question 2

The direction of conventional current?

Answer 2

Positive to negative

Question 3

The direction of flow of electrons?

Answer 3

Negative to positive

Question 4

What is potential difference?

Answer 4

The work done per unit charge and is measured in units of volts (V).

Question 5

What is Resistance?

Answer 5

A measure of how difficult it is for current to flow through a material. (The opposition to a current)

Question 6

Relation between current and resistance

Answer 6

A higher resistance means a smaller current
A lower resistance means a larger current

Question 7

Ohm’s law states

Answer 7

For a conductor at a constant temperature, the current through it is proportional to the potential difference across it

Question 8

For an ohmic conductor, the I–V graph is:

Answer 8

a straight line through the origin

Question 9

For a semiconductor diode, the I–V graph is:

Answer 9

a horizontal line that goes sharply upwards

Question 10

For a filament lamp, the I–V graph:

Answer 10

has an ‘S’ shaped curve

Question 11

What is forward bias?

Answer 11

When the current is in the direction of the arrowhead symbol