$(a)$ What material is used in making the filament of an electric bulb?
$(b)$ Name the characteristics which make it suitable for this.
$(b)$ Name the characteristics which make it suitable for this.
(N/A) The filament of an electric bulb is made of $Tungsten$.
$(b)$ The characteristics that make $Tungsten$ suitable for this purpose are:
$1$. It has a very high melting point (approximately $3380^{\circ}C$),which prevents it from melting even when it becomes white-hot during the emission of light.
$2$. It has high resistivity,which allows it to produce a large amount of heat when an electric current passes through it,enabling it to glow brightly.
$(b)$ The characteristics that make $Tungsten$ suitable for this purpose are:
$1$. It has a very high melting point (approximately $3380^{\circ}C$),which prevents it from melting even when it becomes white-hot during the emission of light.
$2$. It has high resistivity,which allows it to produce a large amount of heat when an electric current passes through it,enabling it to glow brightly.
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Similar Questions
The electrical resistivity of a few materials is given below in ohm-metre. Which of these materials can be used for making the element of a heating device?
$A$. $6.84 \times 10^{-8} \, \Omega m$ $B$. $1.60 \times 10^{-8} \, \Omega m$ $C$. $1.00 \times 10^{-4} \, \Omega m$ $D$. $2.50 \times 10^{12} \, \Omega m$ $E$. $4.40 \times 10^{-5} \, \Omega m$ $F$. $2.30 \times 10^{17} \, \Omega m$
| $A$. $6.84 \times 10^{-8} \, \Omega m$ |
| $B$. $1.60 \times 10^{-8} \, \Omega m$ |
| $C$. $1.00 \times 10^{-4} \, \Omega m$ |
| $D$. $2.50 \times 10^{12} \, \Omega m$ |
| $E$. $4.40 \times 10^{-5} \, \Omega m$ |
| $F$. $2.30 \times 10^{17} \, \Omega m$ |
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