JC Technology Transistor Voltage Divider 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. 6 V Small base current gives large collector current c Large collector/emitter current b Small base current e

Transistor & Voltage Divider: resistors in series divides the applied voltage Base voltage < 0. 6 V Transistor off Base Voltage > 0. 6 V 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