Question

define.power. find the energy in KWh consumed in 10 hours by two devices of power100W each​

Answer 1

Answer:

Rate if doing work

Answer : 1 kWh

I hope it will help

Answer 2

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Definition:

Power:

1. Power is the rate at which work is done to convert energy.
2. It has no direction and hence is scalar quantity.
3. SI unit of power is Joule per second or Watt and is represented by J/s or W
4. Power = Work/time or Energy/time.
5. Dimension of power is ML²T^-3

Given:

Two devices of power 100 W (watt) and consume energy for 10 hours

To find:

Energy in KWH( kilowatt hour) = ?

Explanation:

Energy = Power × time

Power = 100 W

1000 W = 1KW

100 W = 100/1000 = 0.1 KW

Time = 10 hours

Energy consumed by two devices = 2 × 0.1 KW × 10 H

Energy = 2 KWH

Answer:

Thus, Energy consumed by two devices in 10 hours with power 100 W is 2 KWH (kilowatt hour)

Additional points:

• To convert Watt to kilowatt we have to divide Watt with 1000
• If we have to convert hour into second then 1 hour = 60 × 60 = 3600 seconds
• Try solving more questions to get good hold on it