Question

Calculate the electric energy consumed by a 1200W toaster in 20minutes

Answer 1

Answer:

1440 kilo joules

Explanation:

Given :

• Power consumed by a toaster = P = 1200 Watts

• Time for which the power is consumed by the toaster = t = 20 minutes

To find :

• Electrical energy consumed by the 1200 watts toaster

1 minute = 60 seconds,

So:

20 minutes = 20×60 = 1200 seconds

Formula :

• Electrical energy consumed = power × time

Electrical energy consumed = 1200×1200

Electrical energy consumed = 14,40,000 joules

Conversion:

1000 joules = 1 kilo joule

So,

14,40,000 joules = 1440 kilo joules

The electrical energy consumed by the toaster is equal to 1440 kilojoules

Answer 2

Given ,

Electric energy = 1200 w

Time = 20 m or 1200 sec

We know that ,

The rate at which electric energy is consumed in a circuit is called electric power

$\large \sf \fbox{Electric \: Power = \frac{Electric \: energy }{time} }$

Thus ,

1200 = Electric energy/1200

Electric energy = 1440000 J

$\sf \therefore \underline{The \: electric \: energy \: is \: 1440 \: Kilo \: joule }$