Temperature sensing in a light bulb. incandescent lightbulbs use a tungsten wire as the light-producing filament by heating it to a temperature at which it is bright enough to produce light. the temperature of the wire can be estimated directly from the power rating and the resistance of the wire when it is cold. given a 120 v, 100 w lightbulb with a resistance of 22 w at room temperature (20c): a. calculate the temperature of the filament when the lightbulb is lit. b. what are the possible sources of error in this type of indirect sensing? explain.