1. Electricity and Electronics Base of Modern Technology

2. Electricity Flow of electrons Originally conceived of as positive Now we know that they are negatively charged Flows from - to +

3. Properties of Electricity Voltage “Pressure” that moves electrons Also called EMF (Electromotive Force) Measured in Volts (V) Measured between two points

4. Properties of Electricity Current Quantity of electrons flowing past a certain point at one time Measured in Amperes (A) Measured across one point

5. Properties of Electricity Resistance Opposition to flow of electrons Measured in Ohms (Ω) Measured across component(s)

6. Properties of Electricity Relationship of Voltage, Current and Resistance Ohm’s Law V = I*R 1 volt can push 1 amp through 1 ohm

7. DC Current Electrons flow straight through from - to + Used in electronics and computers “Wall warts” (transformers) change from outlet AC to DC AC (Alternating current) is sinusoidal

8. Sources Different types of sources Voltage source Battery Current source Ground

9. Resistors Resist flow of electrons Measured in Ohms with an Ohmmeter Series and Parallel

10. Capacitors Capacitors resist changes in current by storing energy in an electric field and dissipating it Measured in farads Series and parallel

11. Transistors Used as amplifier Changes in V in change V out 3 pins Used by the billions in electronics

12. 555 Timer chip IC (Integrated Circuit) Large quantity components in one package

13. http://ecee.colorado.edu/~mcleod/teaching/Ci rcuits2250/Labs/lab01/index.html http://ecee.colorado.edu/~mcleod/teaching/Ci rcuits2250/Labs/lab01/index.html http://www.play- hookey.com/dc_theory/fundamentals/ http://www.play- hookey.com/dc_theory/fundamentals/ http://en.wikipedia.org/wiki/Resistors http://en.wikipedia.org/wiki/Capacitor