Ch.14 ELECTRICAL ENGINEERING. RELATES BOTH ELECTRICITY AND ELECTRONICS.
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Transcript of Ch.14 ELECTRICAL ENGINEERING. RELATES BOTH ELECTRICITY AND ELECTRONICS.
Ch.14 ELECTRICAL ENGINEERING
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RELATES BOTH ELECTRICITY AND ELECTRONICS
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ELECTRONIC VS ELECTRICAL
ELECTRONIC MADE WITH SEMICONDUCTOR MATERIAL USUALLY SILICON EXAMPLES-DIODES, TRANSISTORS,
RECTIFIERS, SUPRESSORS
ELECTRICAL MADE WITH CONDUCTOR MATERIAL METALS AND ALLOYS EXAMPLES- WIRES, SWITCHES, FUSES
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ALLOY A homogeneous mixture made by
fusing two or more metals, or a metal and a nonmetal
To obtain desirable qualities such as hardness, lightness, and strength
Brass is a mixture of zinc and copper
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ELECTRICAL CIRCUITS ELECTRON FLOW OCCURS FROM THE
NEGATIVE TERMINAL (where there is an excess of negative electrons) TO THE POSITIVE TERMINAL (where there is a lack of electrons)
CONVENTIONAL CURRENT FLOWS FROM POSITIVE TERMINAL TO NEGATIVE TERMINAL
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14.1 Electrical Functions Is the role that a component plays in the
control of electric current. Circuit diagrams show where the
components are placed. Ex of components: power supply
Switch
Diode
Light bulb etc
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SYMBOLS FOR CIRCUIT DIAGRAMS
BATTERY
AC POWER SUPPLY
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DIODE
LED
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TRANSISTOR
SWITCH
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RESISTOR
OTHER SYMBOLS PAGE 460 OBSERVATORY
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14.2 DC vs AC CurrentDIRECT CURRENT: UNIDIRECTIONAL FLOW OF ELECTRIC
CHARGE ELECTRONS MOVE CONTINUOUSLY IN
THE SAME DIRECTIONWrite this in your
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ALTERNATING CURRENT:
Alternating flow in which the electrons move back and forth in a regular pattern.
The vibrating motion of electrons allow current to flow.
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POWER SUPPLY PROVIDES THE ENERGY THAT CAUSES
THE CURRENT TO FLOW THROUGH THE CIRCUIT
ADVANTAGES AND DISADVANTAGES OF A BATTERY
A battery is a device that transforms the energy from a chemical reaction into electrical energy.
Advantages: Products that run on a battery are portable
Disadvantage: Batteries have to eventually be replaced. Plus, the chemicals inside a battery are an environmental hazard and leak heavy metals and acids into our environment.
Examples: MP3 players, watches, remote controls
ADVANTAGES AND DISADVANTAGES OF AN OUTLETAn outlet is designed to have metal prongs in constant contact with an electrical network
Advantages: Stable and long lasting power supply. It also creates very little greenhouse gases (as Hydro Quebec uses water to produce electricity)
Disadvantage: Appliances are needed to be in constant contact with the outlet and has minimal movement.
Examples: TV, Fridge, Computers
ADVANTAGES AND DISADVANTAGES OF A PHOTOVOLTAIC CELLA photo cell (solar cell, or solar panel) generates an electrical current when exposed to light (sun).
Advantages: They can create electrical power to an electric grid, and they can create power on portable devices. They do not produce greenhouse gas emissions and have a life span of 20 – 30 years
Disadvantage: Is dependable on the sun. They are also very expensive to install.
14.3 Power Supplies:Advantages Disadvantages
Battery (chemical energy electrical energy)
Portable Have to be replaced!
Environmental hazard!
Electrical Outlet Stable source of power
Close proximity
Photovoltaic Cell (sun energy electrical energy)
Portable Depends on weather!
Expensive to install!
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