1.

Geyser has a rating 2 kva, 240 v a) What is the electrical energy consumed by (i) kwh (ii) joule if it is used for 90 minutes. b) If the cost of electricity is Rs 4.50 per commercial unit find the cost 

Answer»
Power rating of Geyser = 2kva = 2000W
(because p=vi)
Now,
Power= 2Kw
Time= 90minutes = 3/2hours
Energy consumed = Pxt 
2x3/2= 3Kwh or 3 units.
Now cost of electricity = 3x 4.5Rs/-
= 13.5Rs/-.


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