Please tell me when and where we have to use ohm's law - Physics - Electricity

Question

Please tell me when and where we have to use ohm's law

Sanjeev Kumar Singh · Accepted Answer

Dear Student
Ohm's Law :-
Potential difference (V) across a wire is directly proportional
to current (I) Thus,
<img alt="" height="25" src=
"https://s3mn%20mnimgs%20com/img/shared/discuss_editlive/2143775/2012_04_26_08_56_06/image3455451854581064045%20jpg"
width="48">
=> V = RI
Where R is a constant of proportionality called resistance of
the resistor, it tends to resist the flow of charge through a
conducting wire Its SI unit is Ohm (Ω)
It is applicable for only for conductors provided their temprature
and other physical condition (eg Pressure) remains unchanged
Ohm's Law is applied in a branch of circuit or in the circuit to
find V or I or R
Regards