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प्रश्न
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
विकल्प
Electrical to mechanical
Electrical to chemical
Chemical to mechanical
Chemical to electrical
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उत्तर
Chemical to electrical
Hint: When current is drawn from an electric cell, the chemical energy stored in it changes into electrical energy.
संबंधित प्रश्न
Work done by a boy depends on the time in which he does work.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
Name the physical quantity associated with the 'rate of doing work'.
State larger units of power.
A is a push or a pull ______.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
