electric power

Electricity and Magnetism Level 2

If the current flowing through a lamp drops by 1 percent,what will be the percentage decrease in power ?


The answer is 2.

Alok Patel by Alok patel , 24, India

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2 solutions

Agr Amul
Jul 23, 2014

Correct ans in my view and as per my calculation is 1.99.

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one should apply for such questions when there is percentage difference of less than 5 % the method of error analysis .......want to know more about it just ...wait till 3rd october

ashutosh mahapatra - 6 years, 8 months ago

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@ashutosh mahapatra but in this question this concept is not applying

sakshi rathore - 5 years, 11 months ago

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No sis, It's being applied here. Just take the increase as error then find relative error % Got it dude.....

ashutosh mahapatra - 5 years, 11 months ago

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@Ashutosh Mahapatra – IS THIS THE CORRECT METHOD??? ...we know power=I square RT DECREASE IN CURRENT IS 1% SO ACCORDING TO RAMANUJAN MATHEMATICS OF FINDING%ERROR LESS THAN 5%WE DROP THE DEGREE OF THE TERM WHICH IS CHANGED AND MUTLIPLY IT BY THE CHANGE

sakshi rathore - 5 years, 11 months ago
Ahmed Kamal
Jan 25, 2015

should be = 1.99~2 !

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