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:

Opt. C 500 W for 5 hrs

Explanation:

Energy=Power*Time

1) E= 60*8= 480

2) E= 1000*2 = 2000

3) E= 500*5 = 2500

4) E= 800*1 = 800..

hence opt 3.. 2500

Answer 2

Given :  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.

To Find :  which devices consumes more electric energy in given options

Solution:

Energy = Power x time

60 W bulb used for 8 hours

Energy consumed  = 60 x  8  = 480 Wh   = 0.48 kWh  

1000 W speaker used for 2 hours

Energy consumed  =1000 x  2  = 2000 Wh   = 2 kWh

500 W television used for 5 hours

Energy consumed  =500 x  5  = 2500 Wh   = 2.5 kWh

800 W electric cooker used for 1 hour.

Energy consumed  =800 x  1  = 800 Wh   = 0.8 kWh

2.5  kWh is maximum

hence 500 W television used for 5 hours consumes more electric energy

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