A voltage generator

potential difference

The voltage generator is a device that can create a potential difference between the positive pole and the negative pole.

Generated voltage can be of two types that you can see the symbols below:

Alternate Current

simbolo corrente alternata

Continuous Current

simbolo corrente continua

Continuous current is for example that generated by a battery so that you can locate the "positive" pole, that is the one with the greatest potential.

The alternating current (that of our homes at 220-230 volt) instead inverses its polarity continuously, it does not make sense to mark the positive pole.


Electrician's essential vocabulary


Alternating current and appliances


Single-phase and three-phase electrical system


Alternating voltage


Short circuit


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