Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reasons.Also,give an expression for the resistance of a metallic wire in terms of the resistivity.

Asked by  | 30th Apr, 2012, 08:53: PM

Expert Answer:

The current will flow more easily when thicker wire is used. As resistance offered by the thick wire is less than that offered by the thin wire because R (resistance) = p (rho). l (length) / A (area of cross-section or thickness of wire).
 
And rho is the resistivity of the wire.

So as you can see if area of cross-section ( or thickness) of wire increases, resistance decreases and more current flows through it.
 

Answered by  | 30th Apr, 2012, 09:05: PM

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