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Trignometry

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 Joined: 3 May 2010 Post: 13
6 Jul 2012 22:41:35 IST
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Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Trigonometry

Water Heaters are of same rated voltage.when used to heat 10kg of water from 10degree centigrate to 40degree centigrate,they take 10 minutes and 15 minutes respectively.find the time taken to heat same water from 10 degree to 40 degree,when they are used together.(a) in series (b) in parallel

Blazing goIITian

Joined: 8 Oct 2008
Posts: 8064
7 Jul 2012 12:03:16 IST
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(Vo^2/r)t2=p

(Vo^2/r2)t1=p

For perellel

These are connected in parllel and will run for same time

(vo^2/r1+Vo^2/r2)*t=p

t=ti*t2/T1+t2

for serries

t=t1+t2/2

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