How much current flows through a lamp with resistance 90 ohms when it is connected to a 220- V outlet?
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How much current flows through a lamp with resistance 90 ohms when it is connected to a 220- V outlet?
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Answer:
It would depend at which point in time.
[Assuming the resistance of the filament was performed when deenergised and at ambient temp]
Initially we coulld use ohms law and know what the current would be cold. This would be worst case and o ly for a moment until the filament heats up.
This can be calculated I=V/R which in your case is 220/90=2.44Amps.
But then the filament would get hot, the resistance would shoot up and the current would decrease so I'm afraid that's as far as I can answer without knowing:
-How long the lamp is on for
-what material it is made from.
-is the voltage constant or connected to a grid?
Explanation: