The relationship between potential difference (V) and current (I) is given by Ohm's Law. Ohm's Law states that: \[ V = IR \] where:
V = Potential Difference (Volts)
I = Current (Amperes)
R = Resistance (Ohms)
This law was formulated by the German physicist Georg Simon Ohm.
The correct option is (D): Ohm

The equivalent resistance between the points \(A\) and \(B\) in the given circuit is \[ \frac{x}{5}\,\Omega. \] Find the value of \(x\). 
A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances \[ (R_1=R_2=R_3=R_4). \] When \(R_3\) resistance is heated, its resistance value increases by \(10%\). The potential difference \((V_a-V_b)\) after \(R_3\) is heated is _______ V. 