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Sagot :
This is because of of the heating effect of a current. The glow is a result of current passing through the filament. The current experiences resistance as a result heat is generated. When resistance is at zero, there potential differences is not needed hence temperature generated will be at a constant.
Initially when the lamp is turned on , the resistance of the lamp is low hence a huge amount of current passes through it which makes the temperature of the filament to rise. once the filament gets heated , its resistance will increase to a larger extent as resistance increases with increase in temperature. So this decreases the current passing through it. Hence the temperature stays constant
What is a filament lamp?
A filament lamp is a common type of light bulb. It contains a thin coil of wire called the filament. This heats up when an electric current passes through it, and produces light as a result.
What is resistance ?
The hinderance to the flow of current is called resistance.
To know more about filament bulb here
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