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What will be the current drawn by an ele...

What will be the current drawn by an electric bulb of 40W when it is connected to a source of 220V?

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In this case we have been given power P and voltage V, so the formula to be used for calculating the current will be:
`P = V xx I`
Here, Power, `P = 40` watts
Voltage, `V = 220` volts
And, Current, `I = ?` (To be calculated)
Now, putting these values in the above formula, we get:
`40 = 220 xx I`
`I = (40)/(220)`
`= (2)/(11)`
Thus, Current, `I = 0.18` ampere
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