TL;DR Voltage is represented by V, in units of V (volts). It is the flow of charges from one point in the circuit to another.
Voltage
To quote my textbook:
If energy is expended ( as work ) on a quantity of charge, the ratio of work to charge is given the name voltage. For example, a battery uses chemical processes to do the work on charged particles , thus a voltage appears across its terminals. The unit of voltage in the M. K. S. system is the Volt ( abbreviated V ) . It is equal to energy of one joule given to a charge of one coulomb. In other words, if a total energy of one Joule is required to move a group of charged particles with a total charge of one coulomb from one point to another in a given circuit , then a potential difference of one volt is produced between the two points. We shall use the literal symbol v ( t ) for voltage. (Basic Circuit Theory (Third Edition) , 2017, page 4.)
If the following information confuses you, I would suggest you review Ohm's Law. (Link needed)
Voltage: The electrical potential difference between two points in a circuit.
Voltage is represented by v (lower or upper case, see notes below);
The unit of measure is v (voltage, volts).
Symbolism
V Uppercase
v Lowercase
v(t) Lowercase time-varient
Polarity Reference Direction
In short,
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