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Chapter 26, Problem 021 A common flashlight bulb is rated at 0.23 A and 4.0 V...

Chapter 26, Problem 021

A common flashlight bulb is rated at 0.23 A and 4.0 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 0.98 Ω, what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 4.4 × 10-3 K-1 for the filament material.

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The temperature of flash light

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