transconductance

[trans-kuhn-duhk-tuhns]

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noun Electronics.

the ratio of a small change in anode current of an electron tube at a certain level of output to the corresponding small change of control-electrode voltage, usually expressed in mhos or micromhos.

(loosely) the amplification factor of a tube divided by its anode resistance.

Origin:
trans- + conductance

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Transconductance is always a great word to know.

So is impedance. Does it mean:

when voltage and current reach maximum values at the same time

total opposition to alternating current by an electric circuit

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transconductance

trans·con·duct·ance