Question

2 lamps, one rated 100 (w) at
220 v and other 200 W at 220 v are connected 1) in series, 2) parallel
to electrical main supply 220 V find the current drawn in each case​

Answer 1

Answer:

Resistance R of each lamp from given power P and operating voltage V is obtained from the relation,

 

P = ( V2 / R )  ....................... (1)

 

Hence resistance of 100W, 220 V lamp = (220×220)/100 = 484 Ω

 

Resistance of 200W, 220 V lamp = (220×220)/200 = 242 Ω

 

when lamps are connected in series , equivalenet resistance = 484+242 = 726 Ω

 

Hence current drawn by lamps that are connected in series = 220/726 = 0.3 A

 

When lamps are connected in parallel, each lamp draws current independenly as per its wattage.

 

Current drawn by 100 W lamp = 100/220 = 0.45 A

Current drawn by 200 W lamp = 200/220 = 0.91 A

 

Hence total current drawn by lamps when they are connected in parallel = 0.45+0.91 = 1.36 A

Hope u understand the answer

Thank u and kindly mark my answer as brainliest if found it useful and appropriate.

Hey plz mark my answer as brainliest because someone deleted my answer.

Thank u

Answer 2

Answer:

tell u come or not in my meet