Question

A light bulb has a diameter of 2.17x10^-3m and an unknown length.

a.) If the light bulb has a resistance of 20.5 Ω at room temperature, (which is 20.0 °C) then what is the length of the filament? ______m

b.) At room temperature (20.0 °C) there is a current of 5.85A that flows through the filament when a voltage is applied to it. What is the power output of the filament at room temperature?   _____ W.

c) If the voltage of the bulb remains constant, what will be the temperature of the bulb when it reaches a power output of 60.0 W? The resistivity of tungsten is 5.60x10^-8 Ωm and the temperature coefficient of resistivity for tungsten is 4.403x10^-3/°C. ______ °C

Answer 1