What are current conductors, sources of electric current, direction of electric current

What are current conductors, sources of electric current, direction of electric current, direct current, current strength is short and clear please urgently?

1). A current source is a device that is capable of creating and maintaining a significant excess of electrical charges at its poles – terminals. The current source can be a galvanic cell, generator, battery, etc. 2). To provide energy to the consumer – load, it is necessary to deliver this charge to it. For this, conductors are used – wires containing a huge amount of free electrical charges. By connecting the current source and the current consumer with wires through a key (the key is used to interrupt the current), we form an electrical circuit. 3). Along it, charged particles, repelling from the pole of the same name, under the action of the electric field current source created by the poles, rush to the opposite pole. Moreover, if the signs of the poles do not change, the charged particles move all the time in one direction and such a current is called constant. 4). The action of the current is characterized by the current strength, which shows how much electricity (usually this is the number of electrons) per unit of time (per 1 second) flows through the cross section of the conductor. 5). When the first electrical engineers studied current, they thought that it was a liquid of positive charges flowing through wires, repelling from the positive pole of the source and attracted to the negative pole. Since then, the direction of current movement has been taken for this direction. Although, later it turned out that in fact, in most cases, the current carriers are free electrons (negatively charged) in metals and they move from “-” to “+”, but they did not change the theory.