Voltage and Current

Voltage is defined as the push or the electromotive force received by the electrons at the source.

Voltage is measured in Volts.

The symbol for Voltage is V and the symbol for the unit of voltage (the volt) is also V.
The amount of voltage at the source (a battery or a cell, or  a generator) is determined by the Energy per unit Charge on the battery or cell, or generator.

The Volt is therefore defined as: one Joule of Energy per one Coulomb of Charge.

1 V = 1J/1C

or  V = E / Q

Where: V is the voltage

              E is the energy of the electrons at the source
              Q is the charge of the electrons

Current is the rate of flow of electrons in a circuit.  Electrons moving past a point in a circuit can be measured as the charge flow at that point in a circuit.  This means that if we measure the number of charges moving past a point in a circuit per unit time, we are actually measuring the current.

The symbol for current is I, and the symbol for current is A (Amperes or Amps for short).

according to the above definition, we can then write:

  Current = Charge / time 

Using symbols....                                                I = Q / t

Where: I is the current, Q is the charge, and t is the time

The units will be ....Amperes - A (for current),  Coulombs - C (for charge), seconds - s (for time)