Basic Electronics Engineering I : Electric Chargen

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Basic Electronics Engineering I

:: Electric Chargen

Electricity is a physical phenomenon arising from the existence and interaction of electric charges.The quantity of electricity is the electric charge Q. The unit of charge is called Coulomb, symbolized by C. One coulomb is the total charge of 6.25.10e18 electrons.

The electric charge has either negative or positive polarity, labeled -Q or +Q. Charges of opposite polarity attract. Charges of the same polarity repel.

:: Electric Field

The ability of an electric charge to attract or repel another charge is actually a physical force. The larger the charge, the greater the electric force. This force is called an electric field. It consists of invisible lines of force as shown in figure.

The electrical field between oppositely charged surfaces and the electric field around a stationary charge are illustrated as examples.

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