Q&A for How to Test a Transistor

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  • Question
    How do I differentiate between transistors?
    Community Answer
    By clamping the black probe to one of the three leads. If the multimeter displays high resistance when each lead touched, the transistor is NPN and is good. The reverse of the above conditions is PNP transistor.
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    Not Helpful 9 Helpful 27
  • Question
    How can I tell the difference between a collector and an emitter?
    Community Answer
    A collector accepts input current from the circuit. An emitter send current out into the circuit.
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    Not Helpful 41 Helpful 48
  • Question
    Is there any difference between the resistance value of base emitter and base collector?
    Community Answer
    Yes - voltage drop is a little higher for the base to emitter than for the base to collector.
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    Not Helpful 7 Helpful 19
  • Question
    How do I test a transistor? How does it work?
    Community Answer
    Using multi meter, find the base, emitter and collector. Clip the black probe to 1 lead then the red probe clip to each 2 leads left and if the 2 leads clipped by the red probe both high resistance, then the transistor is NPN. If the red probe point to the base and black probe point to the emitter and collector then the transistor is PNP.
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    Not Helpful 14 Helpful 14
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