A light bulb is rated 100 W for 220 V ac supply of 50 Hz. Calculate (i) the resistance of the bulb, (ii) the rms current through the bulb.

A light bulb is rated 100 W for 220 V ac supply of 50 Hz. Calculate (i

1.	A light bulb is rated 100 W for 220 V ac supply of 50 Hz. Calculate (i) the resistance of the bulb, (ii) the rms current through the bulb.
Answer» (i) `P=(V^(2))/(R ) rArr R=(V^(2))/(P)=(220xx220)/(10)=484 Omega.` (ii) `I_(rms)=(V_(rms))/(R ) =(220)/(484)=0.45` ampere.

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A light bulb is rated 100 W for 220 V ac supply of 50 Hz. Calculate (i) the resistance of the bulb, (ii) the rms current through the bulb.

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