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प्रश्न
Mention three uses of the carbon arc.
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उत्तर
(i) They are used in light houses.
(ii) They are used in search lights and cinema projection appliances.
(iii) They are used in electric furnace and electric welding.
संबंधित प्रश्न
What is the meaning of the symbol kWh? Which quantity does it represent?
An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate:
(a) the power of the kettle.
(b) the energy transferred in 1 minute.
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Held at rest inside the coil?
(iii) Pulled out again?
What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?
In an electric radiator or room heater, state with reason, why the porcelain tube wound with a nichrome wire is placed between the pole and principal focus of the parabolic concave reflector.
An electric filament lamp is connected to a supply of voltage higher than the recommended value. Give reasons, why compared with a normal performance, the lamp emits a brighter light and its life is shortened.
State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.
