A light bulb is rated 200 W for 220 V supply at 50 Hz. Calculate resistance of the bulb and rms current through the bulb.

Explanation

Here, `P = 200 W, E_(v) = 220 V, v = 50 Hz`
`R = ? I_(v) = ?`
From `P = E_(v) I_(v) , I_(v) = (P)/(E_(v)) = (200)/(220) = 0.1 A`
`R = (E_(v))/(R ) = (E_(v))/(I_(v)) = (220)/(0.91) = 242 ohm`