How is three-phase electricity generated

Three-phase current explained in an easy-to-understand way


Difference between current and voltage



... precisely when no consumer is connected to the source, such as with removed batteries or sockets to which nothing (and therefore no consumer) is connected.


A good analogy to this is the closed faucet. Water pressure is applied to it (corresponds to voltage), but no water flows or "flows". If you open the tap, water flows out. If a consumer is connected to a battery, electrons flow out of one pole of the battery, through the consumer and back into the other pole of the battery.

The battery with the consumer, or generally a source with a consumer, corresponds to an open water tap.


So far, the term "source" has been used. An electricity source (e.g. battery or 230V socket) initially only represents a voltage source. Only when a consumer is connected does a current begin to flow, i.e. the voltage source becomes a voltage AND current source.

Note: In electrotechnical terminology, the terms current source and voltage source are differentiated from one another and have special meanings.

But that is going far too far here.

In everyday life it is sufficient to understand voltage as a cause and current as an effect.

In order for a light bulb to light up (= effect), a current must flow, and for this you need (as a cause) a voltage (battery, etc.).