Explain the following.
(a) Why is the tungsten used almost exclusively for filament of electric lamps?
Why are the conductors of electric heating devices, such as bread-toasters
and electric irons, made of an alloy rather than a pure metal?
(c) Why is the series arrangement not used for domestic circuits?
(d) How does the resistance of a wire vary with its area of cross section?
Why are copper and aluminium wires usually employed for electricity
transmission?
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Answer is d write the d option
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a)Tungsten is used exclusively for electric light filaments because it has lowest coefficient of thermal expansion, high melting point and its good tensile strength.
b)Copper and aluminum are good conductors. Wires are wrapped with a material called an insulator. This material does not easily carry electrons. ... When current passes through the wires inside the bulb, electrical energy changes into heat energy and light energy.
c)A series arrangement is not used for connecting domestic electrical appliances in a circuit because if one electrical appliance stops working due to some defect, then all other appliance also stop working as the whole circuit is broken
d)
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