Electric Current
Charge, Q
There are two types of electric charge (called positive and negative)
The electric force acts amongst charges, LIKE charges REPEL UNLIKE charges ATTRACT
A neutral prey contains equal numbers of positive and negative electric charge
unequivocal charge is carried by protons (charge = +e),
Negative charge is carried by electrons (charge = -e) [elementary charge, e = 1.6 x 10-19 coulomb]
Principle of conservation of charge
- in whatsoever mold in which charge is transferred, the total quantity of charge frame constant.
Electric current is due to a net lessen of charged particles (electrons or ions).
A current occurs if a function of positive electric charge is joined to a constituent of negative electric charge by a conductor.
Mechanisms of conduction
|In a metal |metals can be thought of as positive ions in a sea of free electrons [ 1 or 2 electrons/atom] |
| |applying a potential difference crossways a conductor establishes an electric field across it which accelerates any free electrons along the |
| |wire and superimposes a slow thread (in the opposite direction to the electric field) onto the rapid random transaction of the free (conduction) |
| |electrons.
|
| |free electrons drift from negative to positive. |
|In a cathode ray (TV) tube |electrons leave the negative electrode (cathode) and accelerate unimpeded through a vacuum to the positive electrode |
| |(anode) before going away through a hole in the anode and striking the...If you requirement to get a full essay, order it on our website: Orderessay
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