calculate the monthly bill for a heater of resistance 25 ohm which is used on 220 v mains such that its daily use in for 3 hours t

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1. Explanation:

   R=25ohm

   V=220V

   Power=V^2/R

   so power=220×220/R

   P=48400÷25

   P=1936

   so power=1936watt

   We have to find it in kilo So 1936÷1000

   1.936Kilowatthour(kwh) or 1.936unit

   For 1Hour=1.936kwh

   so for 3Hour in a day

   so in 30days we have 28days there is 28×3=84hours

   so for 84 hours or 28 day or in a mont the total unit consumed by heater=84×1.936=162.624kwh or unit

   so amount will be 4.20×162.624

   so the total amount consumed by heater if used 3 hrs. daily for a month=683.02rs

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