Question

what is ohm's law . and written equation
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Answer 1

At constant temperature, the potential difference between two points in that wire is directly proportional to the current flowing through it.

$v = ir$

where r is the resistance of the wire and it depends upon the length, cross-sectional area and Material of the wire.

$r = \gamma \times \frac{l}{a}$

where,

gamma is the resistivity of wire,

l is length of wire, and

a is area of cross section of wire.