Question

Q1 ) Why does the resistance of a wire vary with its area of cross section ?
Q2) Why is the series arrangement not used for domestic circuits ?
Q3) Why is the tungsten used almost exclusively for filament of electric lamps?

Answer 1

q1. since R=(resistivity×lenth)/area

so resistance vary with area of any conductor

q2. series arrangement not use bcz
in series R = r1+r2+r3....................
increase highly which oppose electricity
but in parallel 1/R=1/r1+ 1/r2+ 1/r3........
result reduce resistance and electric flow very well
hence series arrangement not use in home

q3. since tungsten have very high resistance therefore it is use in electric lamps

Answer 2

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3) The melting point and resistivity of tungsten are very high. It does not burn very esay at a high temperature. The electric lamps glow at very high temperatures. Hence, tungsten is mainly used as heating element of electric bulbs.

2) series arrangement is not used in domestic circuits. Because

◾ There is voltage division in series circuits. Each component of a series circuit receives a small voltage for a large supply voltage. As a result, the amount of current decreases and the device becomes hot.

1) Resistance (R) of a wire is inversely proportional to its area of cross-section (A):

R∝1/ A

I hope, this will help you

Thank you____❤

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