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Electricity and Electronics

Electricity and Electronics. Base of Modern Technology. Electricity. Flow of electrons Originally conceived of as positive Now we know that they are negatively charged Flows from - to +. Properties of Electricity. Voltage “Pressure” that moves electrons

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Electricity and Electronics

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  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 Vin change Vout • 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/Circuits2250/Labs/lab01/index.htmlhttp://ecee.colorado.edu/~mcleod/teaching/Circuits2250/Labs/lab01/index.html • http://www.play-hookey.com/dc_theory/fundamentals/ • http://en.wikipedia.org/wiki/Resistors • http://en.wikipedia.org/wiki/Capacitor

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