Question

Asked Apr 8, 2019

A certain light bulb has a tungsten filament with a resistance of 19.0

Ω when at 20.00C and 150Ω when hot. Assume tungsten’s resistivity varies linearly with temperature over this temperature

range. Solve for the temperature of the hot filament.

Step 1

Temperature variation of resistance of tungsten is,

Step 2

R_{0} is the resistance at reference temperature T_{0}. Usually, it is taken as 20^{0}C.

The temperature coefficient of resistance of tungsten is taken as 4.5×10^{-3 0}C.

Rewrite the above equation for *T*.

Step 3

Substituting the...

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