Temperature doesn't affect resistance
(Resistance x Length)/Area= Resistivity
Resistivity is the resistance between opposite faces on a 1m cube of a material
A copper wire is heated up then connected to a supply. Describe what happens to the voltage drop across the wire.
It increases
It decreases
It stays the same
What factors affect resistance
Length
Temperature
Frequency
Area
Time
Two resistors are in parallel. The resistance will go:
Up
Down
A voltage source has been applied to a resistor and a reading of 2A was found. Later it was found that the current has increased to 2.7A despite the voltage not changing.
The temperature increased
The temperature decreased
What is the formula for the temperature coefficient of resistance
R=Ro(1+α(T-To))
R=Ro(1xα(T-To))
Ro=R(1xα2))
R=Ro(αT)
Resistance=(Resistivity X Length)/Area
