Wikipedia about electric current
The movement of electric charge is known as an electric current, the intensity of which is usually measured in amperes. Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current.
By historical convention, a positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part. Current defined in this manner is called conventional current. The motion of negatively charged electrons around an electric circuit, one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of the electrons. However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once. The positive-to-negative convention is widely used to simplify this situation.
What is the work of the electricity
Most people more or less have some idea of ??what is in their work electrician. Increasingly, however, his task is not only the installation and repair of electrical installations as well as for solving a variety of problems with the existing installations. It is true that, in a residential electrician main task is to install appropriate cables still in the process of building a house. Electricians installations also involved in other, less associated with electrical devices such as intercoms or monitoring. Often, as far as their powers, electrician designs the future electrical installations.
Australia and the job of electrician
An electrician's license entitles the holder to carry out all types of electrical installation work in Australia without supervision. However, to contract, or offer to contract, to carry out electrical installation work, a licensed electrician must also be registered as an electrical contractor. Under Australian law, electrical work that involves fixed wiring is strictly regulated and must almost always be performed by a licensed electrician or electrical contractor. A local electrician can handle a range of work including air conditioning, data, and structured cabling systems, home automation & theatre, LAN, WAN and VPN data solutions, light fittings and installation, phone points, power points, safety inspections and reports, safety switches, smoke alarm installation, inspection and certification and testing and tagging of electrical appliances.
Electrical licensing in Australia is regulated by the individual states. In Western Australia the Department of Commerce tracks licensee's and allows the public to search for individually named/licensed Electricians.