Definition of 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.
Job of electrician - how it works in Canada?
Training of electricians follows an apprenticeship model, taking four or five years to progress to fully qualified journeyman level. Typical apprenticeship programs consists of 80-90% hands-on work under the supervision of journeymen and 10-20% classroom training. Training and licensing of electricians is regulated by each province, however professional licenses are valid throughout Canada under Agreement on Internal Trade. An endorsement under the Red Seal Program provides additional competency assurance to industry standards. In order for individuals to become a licensed electricians, they need to have 6000 hours of practical, on the job training. They also need to attend school for 4 years and pass a provincial exam. This training enables them to become journeyman electricians. Furthermore, in British Columbia, an individual can go a step beyond that and become a ?FSR?, or field safety representative. This credential gives the ability to become a licensed electrical contractor and to pull permits. The various levels of field safety representatives are A,B and C. The only difference between each class is that they are able to do increasingly higher voltage and current work.
Restricted electrical licenses are also issued for specializations such as motor winder, appliance repair, audio/visual installation and HVAC installation.
Are electrical faults are inevitable?
Actually, modern technological solutions in the design and construction of electrical installations, make electrical services are becoming less necessary. Excellent insulation of cables and their arrangement can make the most electrical work will be the installation of such electrical lines, not during their operation. Does this mean that in the future, avoid any electrical failures? The answer to this question is simple and of course negative, because although more and better solutions are continuously implemented many failures simply impossible to predict, even using the most modern electrical installations.