मराठी

Explain Why, Tungsten is Used for Making the Filaments of Electric Bulbs.

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प्रश्न

Explain why, tungsten is used for making the filaments of electric bulbs.

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उत्तर

Tungsten is used for making the filaments of electric bulbs because it has a very high melting point (3380°C). It does not melt down and thus remains white hot.

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पाठ 4: Electricity - Exercise 8

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लखमीर सिंह Physics [English] Class 10
पाठ 4 Electricity
Exercise 8 | Q 14

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

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


The safety device based on the heating effect of electric current is called a ______.


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(b) How much energy is transferred to the heater each second?


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


The elements of electrical heating devices are usually made of:

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


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:

  1. the total current taken from the supply
  2. the resistance of each heater and
  3. the energy supplied in kWh to the three heaters in 5 hours.

Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


Give Scientific reason.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.


Name any six domestic appliances based on the heating effect of electric current.


What does overloading cause?


Name some devices that run using heat effect of electric current


How does use of a fuse wire protect electrical appliances?


Name two electric devices for each where

  1. heating effect of current is used and
  2. magnetic effect of current is used.

Copper wire offers very little ______ and does not get heated up quickly.


A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.


What is a trip switch?


Explain why fuse wire is always connected in a series arrangement.


An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in 

  1. kilowatt hour and
  2. joules.

Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

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