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
