summary of current

summary

● Laws of electrostatic charges: Like charges repel; unlike charges attract.

Electrical charge (Q) is measured in coulombs (C).

● One coulomb is equal to 6.24 3 1018 electrons.

An electric current is the slow drift of electrons from an area of negative charge to an area of positive charge.

● Current flow is measured in amperes.

● One ampere (A) is the amount of current that flows in a conductor when 1 coulomb of charge moves past a point in 1 second.

● The relationship among current, electrical charge, and time is represented by the formula:

introduction to basic electricity and electronics technology-0074

● Electrons (negative charge) represent the charge carrier in an electrical circuit.

● Hole movement (positive charge) occurs in the opposite direction to electron movement.

● Current flow in a circuit is from negative to positive.

● Electrons travel very slowly through a conductor, but individual electrons move at the speed of light.

● Scientific notation expresses a very large or small number as a numeral from 1 to 9 to a power of 10.

● If the power-of-10 exponent is positive, the decimal point is moved to the right.

● If the power-of-10 exponent is negative, the decimal point is moved to the left.

● The prefix milli– means one-thousandth.

● The prefix micro– means one-millionth.

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