Transistor & Voltage Divider

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Presentation transcript:

Transistor & Voltage Divider JC Technology Transistor & Voltage Divider

Transistor & Voltage Divider Transistor: electrical switch Three leads: emitter, base, collector

Transistor & Voltage Divider Switch on transistor: Base voltage > 0.6V Small base current gives large collector current Small base current Large collector/emitter current b c e

Transistor & Voltage Divider Voltage Divider: resistors in series divides the applied voltage Base voltage < 0.6V Transistor off Base Voltage > 0.6V Transistor on

Transistor & Voltage Divider Transistor Circuit Output LED/Bulb/motor etc. Input Voltage divider Process Transistor Base Voltage

Transistor & Voltage Divider

Transistor & Voltage Divider LDR – output controlled by light levels Light = low resistance = low voltage Dark = high resistance = high voltage

Transistor & Voltage Divider LED on in daylight

Transistor & Voltage Divider LED on in daylight Variable resistor sets light level

Transistor & Voltage Divider LED on in darkness Variable resistor sets light level

Transistor & Voltage Divider Thermistor – output controlled by temperature levels Hot = low resistance = low voltage Cold = high resistance = high voltage

Transistor & Voltage Divider Thermistor – output controlled by temperature levels Variable resistor sets temperature level