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The graph of current against voltage for a 220 V bulb is given below. Can we calculate the resistance of the light bulb using the graph? How much is it? Why does the bulb usually burn out immediately after switching on?
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The resistance of the bulb depends on the voltage on the bulb.
At a rated voltage of 220 V, the resistance is .
The bulb often burns out immediately after switching on because when the filament is still cold, its resistance is small, and therefore a large starting current flows.
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