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CBSE Class 10 Answered

Q1.water in an electric kettle connected to a 220V supply took 5 minutes to reach its boiling point .How long would it have taken if the supply had been of 200V? ans(Rs8.80 )
Asked by kanudha gupta | 19 Feb, 2011, 12:00: AM
answered-by-expert Expert Answer
Dear student,

Power = V2/R

 

Heat gained = (V2/R) t

 

(V12/R) t1 = (V22/R) t2 

 

t2 = (220/200)2 x 5 = 6.05 min

 

 

team
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Answered by | 21 Feb, 2011, 12:59: PM

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