1. Introduction to Electrical Technology Illinois CTE Curriculum Revitalization Initiative - Technology & Engineering Education

2. Learning Objectives 1. Understand the difference between electrical technology and electronic technology. 2. Identify science and mathematical concepts applied in electrical technology.

3. Terms to Know Alternating current (AC) Direct current (DC)Power Circuits Electrical technology Ratio Conduction Electronic technology Resistance ConductorMagnetismSemiconductor CurrentOhm’s LawVoltage

4. WHAT PROBLEM DOES THIS TECHNOLOGY SYSTEM SOLVE? HOW DOES THE FLASHLIGHT ASSIST PEOPLE IN SOLVING A PROBLEM OR EXTENDING HUMAN CAPACITY? Flashlight – A Technology System

5. Objective 1 Understand the difference between electrical technology and electronic technology. What is the difference between electrical technology and electronic technology?

6. Electrical vs. Electronic Technology Electrical Technology  The technology of producing, storing, controlling, transmitting and getting work from electrical energy  Example applications:  Power plant generator  Flashlight  Electric motor in a can opener  Doorbell  Electric heater  Hair dryer

7. Electrical vs. Electronic Technology Electronic Technology  The technology of using small amounts of electricity for controlling, detecting and information collecting, storing, retrieving, processing and communicating  Example Applications:  Thermostat for controlling temperature  Metal detector  Videotape recorder  Computer  Pocket calculator  Telephone  Radio  Television

8. Objective 2 Identify science and mathematical concepts applied to electrical technology. What are some science and mathematical concepts that are applied in electrical technology?

9. Math and Science in Electrical Technology Resistance – the opposition of the flow of electrical systems Conduction – the transmission of heat, sound or electricity through matter  Conductor – a material containing many free electrons that move through the material easily  Semiconductor – a material whose electrical conductivity can be precisely altered by manufacturing processes

10. Math and Science in Electrical Technology Current - the total amount of electrons flowing through a circuit per unit time  Alternating current (AC) – a current that periodically reverses its direction of flow  Direct current (DC) – a current flowing in one direction Voltage – the force that moves electrons Power - the rate of doing work or the rate of transferring energy

11. Math and Science in Electrical Technology Circuits – complete paths of electric current including the source of electrical energy  Electric circuits provide a means of transferring and using electrical energy to produce heat, light and sound as well as chemical changes. Magnetism – the property of some materials to attract or repel others

12. Math and Science in Electrical Technology Ohm’s Law – the linear relationship between voltage and current through an electrical device  Named after Georg Ohm (1787 – 1854), German physicist  Mathematical equation: I = V/R  I = current  V = voltage  R = resistance Ratio – the relationship in quantity, amount or size between two or more things