Circuit Idea/Specific Circuit Questions

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Passive Voltage-to-Current Converter
What is the cause and effect relation in a voltage-supplied Ohm's circuit? What does the resistor convert here - energy or information? Is the circuit reversible (can we swap circuit inputs and outputs)? How does a series connected load affect the circuit? How can we decrease the error caused by the load? How do we eliminate the error at all? Is there any relationship between this passive and the active version? If yes, how do we convert the passive version into an active one? What are the input and output resistances?

Passive Current-to-Voltage Converter
What is the cause and effect relation in a current-supplied Ohm's circuit? What does the resistor convert here - energy or information? Is the circuit reversible (can we swap circuit inputs and outputs)? How does a parallel connected load affect the circuit? How can we decrease the error caused by the load? How do we eliminate the error at all? Is there any relationship between this passive and the active version? If yes, how do we convert the passive version into an active one? What are the input and output resistances?

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How do We Create Sinusoidal Oscillations?
How oscillations arise in nature? Why does an LC tank consist of two "heterogeneous" accumulating elements (a capacitor and an inductor)? Why is it not assembled by two "homogeneous" elements (both capacitors or both inductors)? What is the role of these elements in the LC circuit? What do they actually do there? What are they? Why does the energy in an LC tank "have no peace"? What make it circulate (in theory, infinitely) between the two components? What makes the accumulating elements discharge completely? Why does an LC oscillation have a sinusoidal shape? Why is it no with linear or other shape? Why does not the LC natural frequency depend on the amount of the "pushed" energy? Why is the oscillation curve symmetrical? What are the differences between LC and other (RC, relaxation, etc.) oscillations? Is there any likeness between them and what is it? What is the connection between an LC tank and a pendulum? What is the "capacitor" and what is the "inductor" in a pendulum?