- #1
davidbenari
- 466
- 18
Homework Statement
Why is the resistance lower in a bulb which is turned on? (Compared to when it has been off)
One bulb which is off has a measured resistance of ##27.0 M\Omega##
When it is on it has a measured resistance of #380.9375 \Omega##
Homework Equations
##\rho (T)=\rho_o(1+\alpha \Delta T) ##
The Attempt at a Solution
I think this is due to the temperature dependence of resistivity. This problem has come from an experiment we had to do. But I can't believe the drastic drop in resistance.