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A transistor has three leads, called the base, the collector, and the emitter. The voltage of the base (in relation to the ground) determines whether and how much current flows from the collector to the emitter. An NPN transistor can be off, meaning that there is no (or very little) voltage from the base; partly on, meaning that there is some voltage from the base; or saturated, meaning that it is receiving full voltage from the base. A saturated transistor allows the current to flow from the collector to the emitter unopposed; a partly on transistor provides some resistance; and a transistor that is off provides full resistance. A PNP transistor is similar to an NPN transistor except it performs the opposite function: when it is saturated, the current is fully resisted; when there is no voltage from the base, the current is not at all resisted; and when it is partly on there is some resistance.

In sum, a transistor controls the flow between the collector and the emitter based upon the voltage of the base. this is carbage. a transistor is basicaly two diodes back to back base being common TO BOTH DIODES because of inpurity doping on purpose at the depletion region the transistor will control the current flow on the other diode. Once it reaches saturation both diodes conduct therefore current can flow in BOTH DIRECTIONS ACROSS IT.

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βˆ™ 16y ago
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βˆ™ 11y ago

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.

The transistor is the fundamental building block of modern electronic devices, and is ubiquitous in modern electronic systems.

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βˆ™ 10y ago

The transistor is the one that controls the collector and emitter of power supply. The flow of power supply is based on voltage.

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βˆ™ 16y ago

Based on the application, a transistor can be used as a switch or a signal amplifier in a circuit. - Neeraj Sharma

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βˆ™ 12y ago

amplify electronics signals and power

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Q: What is the purpose of a transistor in a circuit?
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