Temperature of the filament when the flashlight is on
Question: A tungsten filament used in a flashlight bulb operates at 0.20 A and 3.2 V. If its resistance at 20oC is 1.5?, what is the temperature of the filament when the flashlight is on?
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A 25.0-Ω bulb is connected across the terminals of a 12.0-V battery having 3.50 Ω of internal resistance. What percentage of the power of the battery is dissipated across the internal resistance and hence is not available to the bulb?
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