Question

How to find resistence when length and area of crossection is given?

Answer 1

Answer:

A wire made of a copper alloy is 5 m in length and has a cross-sectional area 1 mm2. Its resistance is 0.15 W.

...

resistivity = resistance × area / length.

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2. Electric current 4. Electromagnetic induction

Resistance and resistivity Electricity from movement

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Answer 2

Resistance of a wire is directly proportional to the length of the wire and inversely proportional to the area of its cross - section, i.e.

$r \: \infty \: l \\ r \infty \binom{1}{a}$

To remove the sign of proportionality, we use a constant Rho ,i.e. which indicates the resistivity of the wire .

So, the final formula is

$r = \binom{rho \times l}{a}$