There is two types of current. Direct current and alternant current. The one running in only one direction is Direct current.
It is called an alternating current
Alternating current would fit this description.
From your question it sounds like alternating current.
Positive electrical flow is electrons flowing in one direction in a wire, if they change the direction of flow that would be a negative flow. If they change direction quickly, say 60 times a second, that would be alternating current, which is what we have in the united states as household electricity.
One method to figure out which direction a stream is flowing, is by elevation. Usually, streams flow towards higher elevation
It is called an alternating current
Alternating current would fit this description.
. . . then that would be alternating current, or simply, 'AC'.
Polarity
Current flowing in only one direction.
This is known as DC. Direct Current.
Direct current (DC) is nothing but an electric current flowing only in one direction.
From your question it sounds like alternating current.
Alternating Current which reverses its direction regularly at certain intervals Direct Current flowing continuously in one direction only
From your question it sounds like alternating current.
They both only allow current in one direction, but the LED emits light when current is flowing.
It's a good conductor of current flowing in one direction, and a good insulator when current tries to flow in the other direction.