Lag1989 problem number 15.7

Lag1989 problem number 15.7

On the base of the incandescent bulb with tungsten filament it is written: 120 V; 60 watts. When measuring the resistance of this light bulb in a cold state on the Whitson bridge, it turned out that it is only 20 Ohms. Find the normal temperature t of the filament filament, if the temperature coefficient of resistance of tungsten is α= 5 * 10⁻³ 1/°С.

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