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Name Two Safety Devices Which Are Connected to the Live Wire of a Household Electric Circuit - Physics

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प्रश्न

Name two safety devices which are connected to the live wire of a household electric circuit

उत्तर

Fuse, MCB Switch

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2017-2018 (March) Set A

संबंधित प्रश्न

In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours everyday. Calculate the electric consumed in 30 days.


An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least: 

(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A


A current of 2 A is passed through a coil of resistance 75Ω for 2 minutes. (a) How much heat energy is produced? (b) How much charge is passed through the resistance?


An electric bulb is rated 250 W, 230 V. Calculate:

  1. the energy consumed in one hour
  2. the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.

An electric bulb marked 220 V, 100 W will get fused if it is made to consume 150 W or more. What voltage fluctuation will the bulb withstand?


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?


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.


What do you understand by ‘earthing’? What are the advantages of earthing in a household electric circuit? Explain, how it is done?


A conductor of 10 Ω is connected across a 6 V ideal source. The power supplied by the source to the conductor is ______.


A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.


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