1.

A circuit has a line of 5 A. How many lamps of rating 40W, 200V can simultaneously run on this line safely ?

Answer»

Solution :GIVEN V= 200 V,P = 40 W , I = 5A N= ?
mP = VI
`n=(VI)/(P) = (200xx5)/(40)`
`=(100)/(4)= 25` lamps
`:. 25` Lamps .


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