A 100W electric bulb is connected to 220V main power supply. Calculate the strength of electric currect passing through the bulb. If the same bulb is taken to USA where the main power supply is 110V, how much electric current will pass through the bulb when connected to mains?

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Solution

As we know, Power = Voltage x Current Power = 100W
In India, Voltage is 220V,
Current = Power/ Voltage = 100/220 = 10/22 =5/11 A = 0.45 A
In USA, Voltage is 110V
Current = Power/Voltage = 100/110 = 10 /11 A = 0.91 A

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