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RE: Current Change

Posted by cpotl on June 14, 2021 at 17:33:08:
" "(I1 - I2) * Rk = (Delta Vk)"
Isn't this telling us that if I1and I2 are equal, so that the difference is 0, there will be no AC drive voltage at the cathode? "
No, because Rk is tending to infinity at the same time as (I1 - I2) is going to zero. The rate at which Rk goes to infinity exactly balances against the rate at which (I1 - I2) goes to zero, so that the product of the two gives the finite and non-zero quantity (Delta Vk).
It is maybe clearer to view it as the equation (I1 - I2) = (Delta Vk)/Rk,
so that ones sees that as Rk goes to infinity, while holding (Delta Vk) approximately fixed (finite and non-zero), then it implies (I1 - I2) goes to zero. This is the CCS limit, where I1 and I2 become equal.