Advertisements
Advertisements
Question
Name the commercial unit of measurement of energy.
Advertisements
Solution
Kilowatt- hour (kWh) is the commercial unit of measurement of energy.
APPEARS IN
RELATED QUESTIONS
Select the correct alternatives
When we rub our hands
Tick the most appropriate answer.
The force applied on a machine to do work is called the
Answer the following in short.
What do you understand by the term efficiency of a machine’?
Name two units of power bigger than watt.
Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
- 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.
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
When we have run a long distance, we feel tired. We have to stop. Why is that?
Running water possesses ______.
When a body falls freely towards the earth, then its total energy
Define kilowatt hour.
