ELECTRICITY 1.ELECTRIC CURRENT 2.ELECTRICAL FUNCTIONS.

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Presentation transcript:

ELECTRICITY 1.ELECTRIC CURRENT 2.ELECTRICAL FUNCTIONS

* An orderly flow of negative charges carried by electrons. * An electronic current is only possible if the free electrons are moving in the same direction.

* DIRECT (DC) – an electric current in which electrons always flow in the same direction * ALTERNATING (AC) – an electric current in which electrons flow in a back-and-forth motion

* An ELECTRICAL FUNCTION is the role played by a component in the control of transformation of electric current - POWER SUPPLY - CONDUCTION - INSULATION - TRANSFORMATION OF ENERGY - CONTROL - PROTECTION

* POWER SUPPLY is the electrical component that produces or supplies electric current in a circuit

* CONDUCTION is the function of any electrical component that can transmit an electric current from one part to another in an electrical circuit. (Metals make very good conductors)

* INSULATION is the function of any electrical component able to block an electrical current. (Rubber makes very good insulators)

* TRANSFORMATION OF ENERGY is the function of any electrical component able to transform electrical energy into another type of energy. Light bulb transforms electrical energy to light energy

* CONTROL function is carried out by any electrical component that can open and close the circuit. Or control and limit the circuit.

* PROTECTION is the function performed by any electrical component that can automatically interrupt the flow of electric current in an abnormal situation. FUSE BOX BREAKER BOX (burns the fuse – melts (shuts down when over when too intense) the tolerated limit)