9.3 Electricity

Question 1

9.3.1 Define resistance:

Answer 1

Resistance is defined as the opposition to current or the voltage per unit current.

Question 2

9.3.2 what is the relationship between Voltage, Current and Resistance?

Answer 2

V = IR
V = Voltage in volts (V)
I = Current in amps (A)
R = Resistance in ohms (Ω)

Question 3

9.3.5 State Ohm’s law:

Answer 3

1. Ohm’s law states that for a conductor at a constant temperature, the current through it is proportional to the potential difference across it
2. Constant temperature implies constant resistance.

Question 4

9.3.6 What is the definition for Resistivity?

Answer 4

Resistivity is a property that describes the extent to which a material opposes the flow of electric current through it.