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प्रश्न
What is energy?
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उत्तर १
The ability or capacity to do work is called energy.
उत्तर २
Energy is defined as the capacity to do work. S.I unit of work is Joule.
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संबंधित प्रश्न
Select the correct alternatives
The correct statement is
What is potential energy ? State its unit.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Name the commercial unit of measurement of energy.
Define the term 'watt'.
What is the common name of '1 kWh' of electrical energy?
Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
The commercial unit of energy is :
- Take two aluminium channels of different lengths.
- Place the lower ends of the channels on the floor and hold their upper ends at the same height.
- Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
- At the moment of releasing the balls, which energy do the balls have?
- As the balls roll down which energy is converted into which other form of energy?
- Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"? - What is the form of the eventual total energy of the balls?
- Which law related to energy does the above activity demonstrate? Explain.
Can you tell?
When can we say that displacement has taken place?
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What should be taken into account for measuring work?
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There is a car. Its tank is full of fuel but it does not move. Why is that?
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
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Which one of the following requires wind energy?
What energy transfer happen in a car engine?
The weight of a person on planet A is about half that on the earth. He can jump up to 0.4 m in height on the surface of the earth. How high he can jump on planet A?
Define kilowatt hour.
