Electric current


Electricity is the set of physical phenomena associated with the presence and flow.
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.The process by which electric current passes through a material is termed electrical conduction, and its nature varies with that of the charged particles and the material through which they are travelling. Examples of electric currents include metallic conduction, where electrons flow through a conductor such as metal, and electrolysis, where ions charged atoms flow through liquids, or through plasmas such as electrical sparks. While the particles themselves can move quite slowly, sometimes with an average drift velocity only fractions of a millimetre per second,the electric field that drives them itself propagates at close to the speed of light, enabling electrical signals to pass rapidly along wires.

Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800, a process now known as electrolysis. Their work was greatly expanded upon by Michael Faraday in 1833. Current through a resistance causes localised heating, an effect James Prescott Joule studied mathematically in 1840. One of the most important discoveries relating to current was made accidentally by Hans Christian

Electric energy
Wires conduct electricity
Electrical Charges
Electric field
Electric current
Generating electricity
Electric potential
Electric voltage
Electromagnetic wave
Electric Motors
More ...

Test your English Language
Table Etiquettes
Tallest Building In The World
Tallest Dams In The World
Tarot Cards
Tatoo Designs
Tea Types
Tea Varieties
Teachers Day
Technologically Advanced Wrist Watches
Teddy Day
Natural Wonders of the World
Most Extensive Metro Systems In The World
New Year Celebration Ideas
Most Beautiful Mosques In The World
Tie Knots
Xmas Lights
Know World Carnival
Precaution while using LPG
Coolest New Businesses In America
Tips To Lose Weight