Life experience or application of science and technology to prove that filament temperature increases and resistance increases

Life experience or application of science and technology to prove that filament temperature increases and resistance increases

When the filament is turned on, the resistance is the minimum and the current is the maximum. Normally, the lamp is the brightest at this time. But according to life experience, it is the darkest at this time, and then it becomes brighter and brighter

The design experiment proves the correctness of the conclusion that the resistance of conductor has nothing to do with voltage and current

Ohm's law of pure resistance circuit: u = I x R can also be written as: r = u / I. in ideal case, the resistance of conductor is determined by itself and has nothing to do with applied voltage and current. Test equipment: adjustable voltage source, ammeter, resistance (preferably high-power resistance), several test procedures of Conductor: (1) connect adjustable voltage source and electric current