Name the Commercial Unit of Measurement of Energy.

Name the commercial unit of measurement of energy.

One Line Answer

Kilowatt- hour (kWh) is the commercial unit of measurement of energy.

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Chapter 4: Work and energy - Very Short Answers 2 [Page 162]

Chapter 4 Work and energy
Very Short Answers 2 | Q 1 | Page 162

Select the correct alternatives

When we rub our hands

Match the following:

Define the term efficiency of a machine.

Give a reason for the following.

The efficiency of a machine is always less than 100%.

How many joules are there in one kilowatt-hour?

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?

Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.