Question

what is ohm's law
and formula

Answer 1

Ohm's law formula. The resistor's current I in amps (A) is equal to the resistor's voltage V in volts (V) divided by the resistance R in ohms (Ω): V is the voltage drop of the resistor, measured in Volts (V).

Answer 2

The orginal Ohm’s law is assertion that current through device is always directly proportion to applied Potential difference to the device-at constant physical parameters.

The ‘essence’ of Ohm’s law is that the resistance is independent of ‘Applied Voltage’ (by both direction of polarity and magnitude) and ‘Current’ passing in conductor- at constant physical conditions like temperature. This leads to straight line on V-I plot : thus stating that ‘R’ is constant for any value of V and corresponding I.

V= iR isn’t Ohm’s law. The relation V=iR is true for both Ohmic and non-Ohmic devices. This equation defines the resistance. i.e. even if V-I graph is isn’t linear, if it’s curved, taking the values of V and I at the given point and putting in V=iR will give the value for R. The R may vary with I or V. eg. semiconductors, AC devices, superconductors,etc.

source:

1. Principles of Physics (10th Ed.) by Resnick, Halliday and Walker, pg 677.
2. NCERT Physics (reprint 2013), XII, Part 1, pg 126, point 2.

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