Question

(i) An electric appliance of rating 300 W is used 5 hours per day in the
month of March. Find the number of units consumed.​

Answer 1

Answer:

Here According to question

An electric bulb whose rating is 300W

is used 5 hours in a day in the month of march it means The month of march consists 31 days

It means bulb is being used for 31 days

As we know

Power = Energy/time

So, Energy = Power × Time

Note :- We will find units not in joule as Kilo watt hour is the commercial unit of Energy

So, Energy = Power × Time

Power = 300W in kilo watt = 300/1000 = 0.3kw

Time = 5 hours in a day . So, in 31 days it will be

= 31 × 5 = 155 hours

So , Energy = 0.3 × 155

= 46.5 Units

46.5 units is being consumed in that particular house

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