1. CHAPTER 12: PART 5
ELECTRICITY
ELECTRIC CURRENT
ELECTRICAL FUNCTIONS

2. ELECTRIC CURRENT
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.

3. TYPES OF CURRENTS 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

4. ELECTRICAL FUNCTIONS
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

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

6. CONDUCTION
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)

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

8. TRANSFORMATION OF ENERGY
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

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

10. PROTECTION
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)