In the context of a differentiator circuit, what is a “current-sensing resistor”?

Published: 24/06/2019
In the context of a differentiator circuit, what is a “current-sensing resistor”?
Source: ELECTRONICS.STACKEXCHANGE.COM

I’m reading through The Art of Electronics and am puzzled by the use of the term “current-sensing resistor” as it pertains to differentiator circuits. In the above figure, the author explains that a perfect differentiator could be made from a capacitor alone, although the current through the capacitor could not be used as an output. So, he says a “current-sensing resistor” must be added. My questi

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