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.
check_circleExpert Solution
Step 1

Temperature variation of resistance of tungsten is,

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Step 2

R0 is the resistance at reference temperature T0. Usually, it is taken as 200C.

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

Rewrite the above equation for T.

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Step 3

Substituting the...

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