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Electrical Engineering CHAPTER 14. Electrical Engineering (404)  Electricity is all around us. It runs our homes, offices and schools.  Designing and.

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Presentation on theme: "Electrical Engineering CHAPTER 14. Electrical Engineering (404)  Electricity is all around us. It runs our homes, offices and schools.  Designing and."— Presentation transcript:

1 Electrical Engineering CHAPTER 14

2 Electrical Engineering (404)  Electricity is all around us. It runs our homes, offices and schools.  Designing and developing electrical systems is what electrical engineers do.  All electrical appliances (like toasters) & electronic devices depend on electrical circuits.  Electrical components (diodes and transistors) are called semiconductors and are made of silicon.

3 Electrical Circuits (404) The conventional current flow is from the positive terminal to the negative terminal.

4 Types of Current (404)  AC  Alternating current  charges continuously change direction forward and back at 60 Hz  Example: outlets (approx 120 V)  DC  Direct current  charges move in one direction  Example: batteries

5 Power Supply (404)  For a electrical or electronic circuit to work, it needs a power supply.  Read p.463 for examples of power supplies.

6 Conduction (404)  The wires in our circuits must be made of a conductive material. Usually copper.  Other things besides wires can conduct. The human body can conduct electricity.  Printed Circuits (466)are an electrical circuit printed on a solid support. They can also be called circuit boards.

7 Insulators (404) a. Insulators are poor conductors. b. They prevent electricity from leaving the wire. c. Example: rubber and plastic

8 Protection (404)  Our homes are equipped with fuses and circuit breakers which are there to prevent serious accidents.  Example: When too many appliances are plugged into an outlet, the electricity goes out.

9 Resistance (466)  It limits the flow of electrons.  It is usually indicated with a colour code.  See handout.

10 Resistance (466)  Depends on: Length, cross sectional area, material, and temperature. Resistance and Temperature

11 Resistance and Thickness

12 Capacitor (466) p.473  A capacitor is a storehouse of charge and energy that can be reclaimed when needed for a specific application.  A capacitor is made up of two metal plates close to each other and separated by an insulating material called a dielectric.

13 Capacitance (466) p.473-474  Capacitance: The ability of a conductor to store energy in the form of electrically separated charges  Capacitance is the ratio of charge to potential difference

14 Diodes (466) p.474  A diode is a small device when put in an electric circuit allows current to flow in one direction but not the other.  Example: LED (Light Emitting Diodes)


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