Question

An electric appliance of rating 300 W is used 5 hours per day in the month of march.find the number of units consumed.
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Answer 1

Number of days= 31

No.of hours per day=5

Total no. of hours= 155 hours

Therefore 46500Wh has been the number of units used.

46.5kWh is the units used.

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Answer 2

$U=46.5\ units$ is the consumption for the month of march.

Explanation:

given:

• power rating of an electrical appliance, $P=300\ W$

• daily usage time of the appliance, $t=5\ hrs$

• No. of days of the month the appliance is used, $d=31\ days$

Now the total hours of usage in the month:

$T=5\times 31$

$T=155\ hr$

Now the watt-hour consumption of the month is:

$E=T\times P$

$E=155\times 300$

$E=46500\ W.hr$

Hence no. units consumed is:

$U=\frac{E}{1000}$

$U=\frac{46500}{1000}$

$U=46.5\ units$

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TOPIC: electrical power supply

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