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Define the bolt,the Watt and the kilowatt-hour. An electric lamp is marked '100 W,220 V'....

Define the bolt,the Watt and the kilowatt-hour. An electric lamp is marked '100 W,220 V'. What do you understand by this? What current is taken by the lamp when it is connected to a 220 V mains supply? What is the resistance of the lamp?
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