Question

An electric appliance of rating 300 w is used 5hrs per day in the month of march. Find the number of units consumed

Answer 1

The number of units consumed by the electrical appliance is 4.5 units.

Explanation:

It is given that,

Power rating of the electrical appliance, P = 300 W

Time, t = 5 hours

We know that the power rating of the electrical appliance is equal to the energy consumed per unit time. It is given by :

$P=\dfrac{E}{t}$

$E=P\times t$

Since, 1 unit = 1000 watt hour

So, $300\ W\times 5\ h\times 30=45000\ Wh$

$45000\ Wh = 4.5\ units$

So, the number of units consumed by the electrical appliance is 4.5 units. Hence, this is the required solution.

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Power rating of the electrical appliance

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Answer 2

Answer:

The number of units consumed by the electrical appliance is 4.5 units.

Explanation:

It is given that,

Power rating of the electrical appliance, P = 300 W

Time, t = 5 hours

We know that the power rating of the electrical appliance is equal to the energy consumed per unit time. It is given by :

so,

p=E/T

E=P×T

since,

1 unit = 1000 watt hour

300w×5h×30 = 45000

45000wh = 4.5 units

So, the number of units consumed by the electrical appliance is 4.5 units. Hence, this is the required solution