Question

What is the Electrical Energy of a 750 W waffle iron that is used for 15 min *

Answer 1

Answer:

power = energy/time taken    

here,  power = 750w

         time = 15 minutes = 1/4 hour

         750  =  energy * 4/1        [reciprocal of 1/4 as it goes up]

         energy =750/4

         energy = 187.5 joule

Explanation:

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Answer 2

The electrical energy of a 750 W waffle iron that is used for 15 min is 675 KJ

We know, the power of an object is defined by the work done or energy consumed or energy produced by the object per a particular given time.

∴ Power = $\frac{Work Done}{Time}$

In the given question,

Power of the waffle iron = 750 W

Time for which it is used = 15 min

                                         = 15 × 60 sec

∴ According to the equation,

Work Done = Power × Time

                    = 750 × 15 × 60 J

                    = 675000 J

                    = 675 KJ

Now, Work Done = Amount of electrical energy.

∴ The Electrical energy is 675 KJ.