Advertisements
Advertisements
प्रश्न
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Advertisements
उत्तर
Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
APPEARS IN
संबंधित प्रश्न
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 we rub our hands
Define the term efficiency of a machine.
Tick the most appropriate answer.
The force applied on a machine to do work is called the
Define the term 'watt'.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
There is a car. Its tank is full of fuel but it does not move. Why is that?
Which one of the following requires wind energy?
Find out the form of energy possessed by the following thing.
A rock on the top of a hill
