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Mention how NPN and PNP transistor works?

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In a circuit when NPN is used,

  • No current flowing from A to D = No flow from X to Z
  • Current flowing from A to D = Current allowed to flow from X to Z

When PNP is used,

  • No current flowing from A to D = Current is allowed to flow from X to Z
  • Current flowing from A to D = No current flow from X to Z

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