AC & DC DEVICES:

DIODES:
SCRS:
RECTIFIERS:
TRANSISTORS:
AMPS:
OP-AMPS:
REGULATORS:
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SCRs are similar to a diodes but it will not pass current until a trigger current appears at the gate input.
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Transistors is a transfer-resistor with 3 sections, a base an emitter and a collector.  They are used to amplify signals applied to the base which controls a larger emitter-collector current. See this weeks lesson for details on this amazing device.
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Diodes allow cuurrent to flow only one way.  They are used on filters and rectifiers.  They have 2 sections, the 
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I want to congradulate you students for progressing to the 2nd section of automotive electronics.  In this section we will study devices that rectify amplify regulate and control voltages and current.

UJTs
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Thermister
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Phototransistor
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