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How does use of a fuse wire protect electrical appliances? - Science

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प्रश्न

How does use of a fuse wire protect electrical appliances?

थोडक्यात उत्तर
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उत्तर

Fuse wire has low melting point and high resistance. So, whenever there is surge in the electric current, the fuse wire melts and breaks the circuit. This prevents any damage to the electrical appliances. Thus, a fuse wire protects the electrical appliances. 

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पाठ 12: Electricity - Short Answer Questions [पृष्ठ ९४]

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एनसीईआरटी एक्झांप्लर Science [English] Class 10
पाठ 12 Electricity
Short Answer Questions | Q 23. | पृष्ठ ९४

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

When current is switched ‘on’ in a room heater, it ______.


Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.


Why does the connecting cord of an electric heater not glow hot while the heating element does?


An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.


The heat produced by passing an electric current through a fixed resistor is proportional to the square of:  

(a) magnitude of resistance of the resistor
(b) temperature of the resistor
(c) magnitude of current
(d) time for which current is passed


An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current


The elements of electrical heating devices are usually made of:

(a) tungsten
(b) bronze
(c) nichrome
(d) argon


Identify the figure and give its use.


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


Name any two appliances which work under the principle of heating effect of current.


A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:


An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


Unscramble the following words:

SFEU


______ wire is used in the filament of the bulbs.


The following is not a safety device.


If 220 V potential difference is applied across an electric bulb, a current of 0.45 A flows in the bulb. What must be the power of the bulb?


In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A B C D

In a set up the students coated iron nails with zinc metal and noted that, iron nails coated with zinc prevents rusting. They also observed that zinc initially acts as a physical barrier, but an extra advantage of using zinc is that it continues to prevent rusting even if the layer of zinc is damaged. Name this process of rust prevention and give any two other methods to prevent rusting.


An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.


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