What is the difference between Voltages or Potential Difference? And what are they?

Voltage or potential difference between two points in an electric circuit is1V if 1J (Joule) of energy is expended in transferring 1 C of charge between those points.
It is generally represented by the symbol V and measured in volts (V). Note that the symbol and the unit of voltage are both denoted by the same letter; however, it rarely causes any confusion.
The symbol V also signifies a constant voltage (DC) whereas a time-varying (AC) voltage is represented by the symbol v or v (t)

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