what is the difference between potential difference and potential drop?
Potential difference is the difference in electric potential between any two points in an electric field or in a circuit.
The difference in voltage between the two terminals of an electrical or electronic component or in a circuit when current flows through them is called potential drop.
Suppose 1 A current flow through a 2 Ω resistance. The potential drop across the resistance is equal to 1×2 = 2 V.