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Electricity Part 2

Electricity Part 2 . Building Electrical Circuits. Components. Components. Resistors Inhibits (resists) the flow of electricity Like debris in a drain slows the flow of water Measured in Ohms Symbol . Components. Non-polarized. Capacitors Allow Alternating Current (AC) to flow

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Electricity Part 2

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  1. Electricity Part 2

  2. Building Electrical Circuits Components

  3. Components • Resistors • Inhibits (resists) the flow of electricity • Like debris in a drain slows the flow of water • Measured in Ohms • Symbol

  4. Components Non-polarized • Capacitors • Allow Alternating Current (AC) to flow • Block Direct Current (DC) • Store electricity temporarily • Measured in microfarads (μF) • Symbols Polarized

  5. Components • Transistors • Uses • amplify weak signals • oscillator • allow signals to flow in pulses • switch • to connect or disconnect other components

  6. PNP NPN Components • Transistors have 3 connections • C – Collector • B – Base • E – Emitter • Symbols C C B B E E

  7. Components • Diodes • Allow electricity to flow in only ONE direction • Acts like a valve in a water pipe • Symbol

  8. Components • LED’s – Light Emitting Diodes • Allow electricity to flow in only ONE direction • Give off light • Used as indicators • Symbol

  9. Components • Control • A variable (changing) resistor • Used as a dimmer, volume control, etc. • Symbol

  10. Components • Semiconductor (Cadmium Sulfide Cell- CdS) • Conducts electricity AND partially resists it at the same time • Special device used as an automatic control. • Symbol λ

  11. Components Wait... NO! NO! NO! • Transformer • A device used to increase or decrease electricity’s voltage and current to “match” other circuits so they function efficiently • Symbol That's better!

  12. Components • Speaker • converts electrical energy into acoustical (sound) energy • Earphones • Also converts electrical energy into acoustical energy • Best to hear very weak sounds • Symbols

  13. Components • Battery • A "cell" • A device in which the reaction between two chemical substances can convert chemical energy into useful electricity • Symbol

  14. A B Components “Key” switch • Switch • Used to connect or disconnect electrical components • When “thrown” it completes the circuit allowing electricity to flow. • Symbols “toggle” switch

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