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I've noticed that sometimes electronic engineers switch terms or have more than one term for the same thing. I wanted to ask, specifically in this question, what are these terms referring to:

  • Resistance looking into the base
  • Resistance from the base
  • Resistance looking into (the) "X"
  • Resistance from (the) "X"
  • Input impedance (or Thévenin equivalent?)
  • Output impedance (also Thévenin equivalent?)
  • If you think there is another term that might be worth clarifying that you know, I'd appreciate it!

Thanks a lot.

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  • \$\begingroup\$ You should take (online or otherwise) an intro to circuit engineering or linear circuits class. Your questions about Thevenin will be answered, and about 80% of your first 4 questions will be answered. You'll spend a significant part of the class learning this stuff. It's not trivial. \$\endgroup\$
    – Daniel
    Commented Aug 9, 2015 at 5:54
  • \$\begingroup\$ A resistance is defined BETWEEN two points. Often the 2nd point is a common ref called "ground. In this case, it is common to specify an "input resistance". However, what means "...from the base" and "...from the X"? I never have heard such a term. \$\endgroup\$
    – LvW
    Commented Aug 9, 2015 at 8:17

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Resistance looking into (the) "X"

Apply a test voltage (say 1V) and measure the test current. The resistance looking into the X is the test voltage divided by the current that flowed.

Resistance from (the) "X"

I'm not familiar with this usage.

Input impedance (or Thévenin equivalent?)

Same thing as Resistance looking into (the) "X"

Output impedance (also Thévenin equivalent?)

Same thing as the resistance in a thevenin equivalent.

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    \$\begingroup\$ resistance from 'x' could mean an external resistor perhaps? - it's hard to guess without context. \$\endgroup\$
    – Jasen Слава Україні
    Commented Aug 9, 2015 at 7:54

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