Ok, I 'll consider it is an extension of the Ohm' s law.
This is my last price.
Ohm played with resistors I guess and was not aware that none of them where perfectly linear.
Actually resistances do not exist.
No, it is not an extension of Ohm's Law. It is a violation of Ohm's Law.
Ohm's Law says that for some devices (including pure metals) it is found that voltage and current are proportional over a wide range, and to a high degree of accuracy. The constant of proportionality is called resistance. For everything else, Ohm's Law does not apply. So, Ohm's Law (when true) tells you something about a device - that it is ohmic. Since Ohm discovered his law, we now know why many materials are ohmic.
Can we get back to quiescent currents and away from this tutorial on basic electrical theory?
Ohm's Law says that for some devices (including pure metals) it is found that voltage and current are proportional over a wide range, and to a high degree of accuracy. The constant of proportionality is called resistance. For everything else, Ohm's Law does not apply. So, Ohm's Law (when true) tells you something about a device - that it is ohmic. Since Ohm discovered his law, we now know why many materials are ohmic.
Can we get back to quiescent currents and away from this tutorial on basic electrical theory?
I have worked on a few amplifiers with external 220/240 selector, and when changed, the Iq would change accordingly, and need adjusting. Not many users/consumers would be aware of this. Harman Kardon PM665 was one such. I think this is typical behaviour, but probably some designs hold Iq fixed over a given VAC input range - which would be better I think.
No; "everybody" thought the relationship was impossibly complex. (Because they did not account for crude batteries and connections, and poor meters.) (Also the modern concept of "circuit" was not generally appreciated.)
Georg thought it might be simple, and carefully crafted solid voltage sources (thermocouples) and did careful experiments. He found a "linear" relationship, within the errors of his apparatus. This was impudent for a junior instructor, and not accepted at the time.
Yes, with much improved sources and instruments, we can see that no practical resistor is "perfect". Mostly we can design the parts and the equipment around the limits of practical materials.
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