2. ATM 202 Automotive Electricity Instructor : Matthew Pence Email: pensky@mediaone.netpensky@mediaone.net Book:Automotive Electricity & Electronics 2 nd Ed. Barry Hollembeak Hours: Monday 6:00pm – 9:30pm Wednsday 6:00pm – 10:00pm

3. The Atomic Structure The Atomic Structure

4. What is an Atom?What is an Atom? An atom is the smallest particle on any element. Element – oxygen (O) or hydrogen (H) Compound – two or more elements combined together – water (H2O) Molecule – Smallest particle of a compound

5. Atom Basics Atom Basics

6. Valence Ring Valence Ring Free ElectronsFree Electrons

7. Conductor Supports the flow of electrons Popular Conductors: –C–C–C–Copper, Silver, gold, iron, aluminum –E–E–E–Each have three or less free electrons in it’s valence ring.

8. Insulators Cannot support the flow of electrons Five of more free electrons in it’s valence ring Popular insulators: –G–G–G–Glass, plastic, rubber, paper, wood

9. Semiconductors Not good conductors or insulators Four free electrons in valence ring. Silicon most popular, made from sand

11. Electricity Electricity is the flow of electrons through a conductor. The human body runs on electrical impulses The human body conducts electricity!!!

12. Electrical Theories Electron theory – electrons moving from negative to positive Conventional theory – electrons flow from positive to negative Does it make a difference?

13. Electromotive Force - Voltage

14. Electrical Flow – Current

15. AC/DC – Highway to Hell Alternating current – Voltage that moves from positive to negative at a frequency that can vary Direct Current – Voltage stays the same in moves in one direction

16. Electrical Restriction – Resistance

17. Review Voltage – Electrical pressure, potential, measured in Volts Current – Flow of electrons past a certain point in a given time, measured in Amps: 6.25 Billion Billion electrons per second = 1 amp Resistance – Opposition to current flow, load or work, consumes voltage, measured in ohms