Question

Five electric fans of 120 watts each are used for4 hours,Calculate the electrical energy consumed in Killowatt hours​

Answer 1

Answer:

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Answer 2

Given :-

Power of each fan = 120 W

Time taken = 4 hours

To Find :-

The electrical energy consumed in kilowatt hours​.

Analysis :-

Here we are given with the power and time taken.

In order to find the energy consumed, substitute the given values from the question accordingly such that energy is equal to power multiplied by time taken.

Solution :-

We know that,

• e = Energy
• p = Power
• t = Time

Using the formula,

$\underline{\boxed{\sf Energy=Power \times Time \ taken}}$

Given that,

Power (p) = 120 W = 0.12 kW

Time (t) = 4 hours

Substituting their values,

⇒ e = 0.12 × 4

⇒ e = 0.48 kWh

Therefore, the energy consumed by each fan is 0.48 kWh.

Energy of 5 fans,

Given that,

Energy consumed by each = 0.48 kWh

Number of fans = 5

Substituting their values,

⇒ 0.48 × 5

⇒ 2.4 kWh

Therefore, the energy consumed by 5 fans is 2.4 kWh.