The formula for measuring potential difference is V=W/Q and this formula is known as Ohm's law. In this equation, V is equal to the potential difference, W is the energy transferred or work done and Q is the amount of the charge. Potential difference can also be measured using the formula V=IR, where I is the current charge and R is the resistance.
Potential difference affects how current flows from one point of a circuit to another. The larger the potential difference, the quicker the flow of the current through a circuit. Potential difference is measured in either volts (V) or Joules per coulomb. In practice, the potential difference within a circuit can be measured using tools, such as a voltmeter.