The effect of temperature on conductivity and resistance
As the temperature of a wire increases, the resistance of the wire will also increase and therefore the conductivity of the wire will fall.
Resistance and conductivity
The resistance of a conductor is a measure of the opposition to the current flowing in it. The resistance will increase as the length of the conductor is increased and the resistance falls as the diameter of the conductor increases. The value of resistance is measured in ohms.
Electrical conductivity measures the ability of a conductor to current to flow in it. Therefore conductivity is the inverse of resistance. The higher the resistance of the wire, the lower the conductivity will be.
Resistance = 1 / Conductivity
Ohm’s Law states that when a current (I), measured in amperes, flows inside a conductor of resistance (R), measured in ohms, the voltage (V) measured in volts, across the wire, will be the product of the current and the resistance.
Voltage V = Current I x Resistance R
Basic safety requirements