There is two types of current. Direct current and alternant current. The one running in only one direction is Direct current.
Alternating current would fit this description.
From your question it sounds like alternating current.
When charges continually shift direction, alternating currents (AC) are present. AC involves charges oscillating back and forth in a circuit, with the direction changing periodically. This is different from direct current (DC), where charges flow consistently in one direction.
An electric current flowing in only one direction is called direct current (DC). This type of current has a constant flow of electrons in one direction from the negative to the positive terminal of a power source, such as a battery.
Look for contour lines that indicate the flow of water downhill. Check for small lines perpendicular to the stream that show the direction of the current. Identify the shape of the stream's valley, as valleys typically point in the direction of the stream flow.
Alternating current would fit this description.
One can determine the direction in which current is flowing by using a device called a compass or by observing the movement of charged particles in a circuit.
. . . 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.
When charges continually shift direction, alternating currents (AC) are present. AC involves charges oscillating back and forth in a circuit, with the direction changing periodically. This is different from direct current (DC), where charges flow consistently 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
They both only allow current in one direction, but the LED emits light when current is flowing.