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# CBSE Class 10 Answered

E=PT    IF WE USE THE P AS WATT T IN Hr so and get E in joule.  Is it correct or it is mandatory to   convert the time in second. To get energy in joules
Asked by kanakchaurasiya29 | 07 Mar, 2021, 20:36: PM
I assume the given equation

E = P × T

E represents energy , P represent power  and  T represent time

SI unit of energy :- Joule ( J )

SI unit of Power :- Watt ( W )

SI unit of time :- Second  (s )

Hence,  Watt × second = Joule

if we consider, Watt × hour = watt × 3600 second = 3600 Joule

Conclusion :-
In SI units time should be in seconds always . If time is to be considered as minutes , hours or any other thing in calculation ,
then  it should be converted into seconds
Answered by Thiyagarajan K | 07 Mar, 2021, 22:20: PM

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