*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.
Answers
For determining which devices consumes more electric energy, we calculate it's number of units using the below formula:
Number of units = Power × Time
1️⃣ For bulb
Number of units = 60 × 8
⇒ Number of units = 480 Wh
2️⃣ For speaker
Number of units = Power × Time
⇒ Number of units = 1000 × 2
⇒ Number of units = 2000 Wh
3️⃣ For television
Number of units = Power × Time
⇒ Number of units = 500 × 5
⇒ Number of units = 2500 Wh
4️⃣ For electric cooker
Number of units = Power × Time
⇒ Number of units = 800 × 1
⇒ Number of units = 800 Wh
Comparing all 4 values,
We observe that television consumes maximum number of units.
So, Television consumes maximum Electric energy.
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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