Advertisements
Advertisements
Question
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
Advertisements
Solution
(a) Power is the quantity whose unit is kilowatt (kW).
(b) Energy is the quantity whose unit is kilowatt- hour (kWh).
APPEARS IN
RELATED QUESTIONS
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.
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
State the unit of energy and define it.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Name the commercial unit of measurement of energy.
What is the common name of '1 kWh' of electrical energy?
- 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.
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
 |
 |
 |
 |
 |
 |
What energy transfer happen in a car engine?
