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प्रश्न
Differentiate between energy and power.
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उत्तर
| Energy | Power | |
| 1. | The energy of a body is its capacity to do work. | The power of a source is the energy spent by it in 1s. |
| 2. | Energy spent does not depend on time. | Power spent depends on the time in which energy is spent. |
| 3. | S.I unit of energy is the joule (J). | S.I unit of power is watt (W) |
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संबंधित प्रश्न
Explain degradation of energy by taking two examples of your daily life.
State the SI unit of work.
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
Fill in the boxe to show the corresponding energy transformation.
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
________ is said to be done when a force is acting on it.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
Work done by this force at any instant is ______.
