Question

*Which of the following devices consumes more electric energy?*

1️⃣ 60 W bulb used for 8 hours
2️⃣ 1000 W speaker used for 2 hours
3️⃣ 500 W television used for 5 hours
4️⃣ 800 W electric cooker used for 1 hour.​

Answer 1

Answer:

50 W speaker used for 2 hours .

Answer 2

Given:

60 W bulb used for 8 hours

1000 W speaker used for 2 hours

500 W television used for 5 hours

800 W electric cooker used for 1 hour.

To find:

The device that consumes most electrical energy.

Solution:

The power consumed by all the devices is given and to find the energy for each of them we can use the following formula:

Energy = Power × time

For 1st option:

E1 = 60 × 8 × 60 × 60 = 1728000

For 2nd option:

E2 = 1000 × 2 × 60 × 60= 7200000

For 3rd option:

E3 = 500 × 5 × 60 × 60 = 9000000

For 4th option:

E4 = 800 × 1 × 60 × 60 = 2880000

The device that consumes maximum amount of electrical energy is 500 W television.

The correct option is 3.