two lamps one rated 100W at 220V are connected (1) in series and (2) in parallel to electric main supply of 220V . find the current drawn in each case.
Answers
Answered by
1
1st hgjjfgjhgfjjghdh idk hi Ian Irish
Answered by
1
Resistance of 1st lamp, R1 = V1²/P1 = (220)²/100
= 484 ohm
resistance of 2nd lamp, R2 = V2²/P2 = (220)²/200
= 242 ohm.
if lamps are connected in series ,
Req = R1 + R2 = 484 + 242 = 726 ohm
so, I = V/Req = 220/726 = 20/66 Amp = 10/33
= 0.3 amp
if lamps are connected in parallel combination,
Req = R1R2/(R1 + R2)
= 484 × 242/(484 + 242)
= 484 × 242/726
= 44 × 242/66
= 4 × 242/6
= 484/3 ohm
so, I = V/Req = 220/(484/3) = 660/484
= 60/44 = 15/11 = 1.36 Amp
I hope it will helps you friend
Similar questions