two lamps one rated 100 watt and 220 volt and the other 200 watt and 220 volt are connected first in series then second in parallel to electric main supply 220 volt find the current drawn current drawn in each case
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Hope it helps you!
The current in Series is 0.30A
The current in Parallel is 1.36A
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tanisingh:
tnxxu so muchhh buddy
parllel wala kse kiy h
Buddy I don't know Hindi please say in English
how can you do in parllel i didn't understand
In parallel,1/R = 1/R1+1/R2
1/484+1/241
multiply the 484 with 1 and 242 and multipy 242 with 1 and 484
now add and take the reciprocal
it is the answer
Answered by
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Answer:
I_series = 0.30 A
I_parallel = 1.36 A
Explanation:
Given :
Two lamps power as 100 W and 200 W at 220 V.
We have resistance formula :
R₁ = 220 × 220 / 100 = 484 Ω
R₂ = 220 × 220 / 200 = 242 Ω
In series combination :
R_net = 484 + 242 Ω
= > 726 Ω
We have ohm's law :
V = I R
I = 220 / 726 A
I = 0.30 A
( ii ) In parallel combination :
1 / R_net = 1 / 484 + 1 / 242 Ω
R_net = 484 / 3 Ω
Given : V = 220 V
I' = 220 / 484 × 3 A
I' = 1.36 A
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