Question

State Ohm's Law using a suitable experiment, explain the terms involved and draw its graphical representation.

Answer 1

Let's experiment,

Take a resistance and apply potential difference across its end. Note down the current reading using Ammeter corresponding potential difference applied.

Applied voltage (V)	current (I)	Ratio (V/I)
(a) 1 V	(a) 0.002 A	500
(b) 2 V	(b) 0.004 A	500
(c) 3 V	(c) 0.006 A	500

Ratio of applied voltage to current flowing corresponding to this potential difference $\frac{V}{I}$ is constant.

According to above experiment,

Ohm's Law states that the ratio of potential difference$\left(V\right)$ between any two points on a conductor to the current$\left(I\right)$ flowing through them are constant, provided the temperature of the conductor does not change.

$\frac{V}{I}=constantor\frac{V}{I}=R$

where,

$V=$ Potential difference in volts

$I=$ Current in Ampere

$R=$ Resistance of conductor between two points in ohm

$\therefore V=I\cdot R$

So, $V\propto I$, it means as voltage increase, current also incerease at a constant resistance.