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प्रश्न
What is energy?
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.
संबंधित प्रश्न
Write true or false of the following statement.
A gum bottle lying on a table has no energy.
Write true or false of the following statement.
In an electric fan, electrical energy changes into the mechanical energy.
Write true or false of the following statement.
One form of energy cannot be converted into another form.
Select the correct alternatives
When a bulb lights up on passing current, the change of energy is
Select the correct alternatives
The correct statement is
Define the term efficiency of a machine.
Answer the following in a word or two or in a sentence.
Write the formula for calculating the efficiency of a machine.
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Define the term 'watt'.
How many joules are there in one kilowatt-hour?
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).
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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Running water possesses ______.
Which one of the following requires wind energy?
Define energy?
Which one of the following is not the unit of energy?
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?
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)
Define kilowatt hour.
