Question

What is the power in kilowatts if a current of 15 ampere flows through a resistance of 10 ohm

Answer 1

P=VI
P=I2R (because V=IR we don't know v so put P=IIR it becomes I2R)
=15 square×10
= 225×10
=2250 W(2250÷1000)
=2.25kw

Answer 2

Given : A current of 15 ampere flows through a resistance of 10 ohm.

To find : The power in kilowatts.

Solution :

We can simply solve this numerical problem by using the following process. (our goal is to calculate the power)

Here, we will be using the following mathematical formula.

P = I²R

Where,

• P = Power in watts
• I = Current in Amperes
• R = Resistance in Ohms

By, putting the available data in the previously mentioned mathematical formula, we get :

Power = [(15)² × 10] watts

or, Power = (225 × 10) watts

or, Power = 2250 watts

Now, we have to convert the unit of power into kilowatts.

Now,

1000 watts = 1 kilowatt

1 watt = 1/1000 kilowatt

2250 watts = (1 × 2250)1000 = 2.25 kilowatts

So,

The power = 2.25 kilowatts

(This will be considered as the final result.)

Hence, the power is 2.25 kilowatts.