There are voltage drops based on Q, dQ/dt, and d(dQ/dt); what about d(d(dQ/dt))?

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In summary, there are three types of voltage drops: capacitive, resistive, and inductive. Capacitive voltage drops are based on the amount of charge, resistive voltage drops are based on the rate of change of charge, and inductive voltage drops are based on the second derivative of charge. However, there may also be a fourth type of voltage drop that is based on changes in the third derivative of charge. This has not been observed in any physical device, but there is no reason why it could not exist.
  • #1
kmarinas86
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Capacitive voltage drops are based on Q.
Resistive voltage drops are based on dQ/dt.
Inductive voltage drops are based on d(dQ/dt).

However, wouldn't there be a logical progression from here? Isn't there a voltage drop for d(d(dQ/dt)), that is to say, some kind of property of the circuit that resists alterations in the acceleration of charge?

Think of it this way:

Capacitance is to position, in the same way that
Resistance is to motion, in the same way that
Inductance is to acceleration, in the same way that
? is to changes in acceleration

This can be likened to how the various results one may get from different vehicles depending on how hard and swifly one presses the power pedal. Alternatively, it can looked upon this way:

1) Some cars will build their acceleration almost instantaneously (e.g. electric cars).
2) Others will take more time to get that same acceleration (e.g. equivalent gasoline-powered cars).

I'd imagine that if a charge is prevented from accelerating, there must be something to act against that acceleration. But this can go both ways to where if a charge is prevented from additional deceleration, then something may act against that deceleration. It would be as though a opposing field were generated simultaneously (but not equally matching) upon the application of a field of opposite polarity. So would the various conditions that determine the rate change and the acceleration of rate change of the presence of these "opposing electric fields" be parameters underlying "other" voltage drops unique from V_R, V_L, and V_C? The fourth one, in particular, would analogous to "mechanical impedance", where a smooth application of torque on a motor may result not in long term angular acceleration but simply an accumulated drop in angular velocity (while the introduction of that torque would be what is necessary to cause that angular acceleration). However, would such voltage drops be separate from resistive, inductive, and capacitive voltage drops, or are those three categories of voltage drops already inclusive of these considerations?

If a "fourth" voltage drop such as this doesn't exist, what is the theory behind that conclusion?
 
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  • #2
As far as I know, it's simply because no physical device has ever been observed that produces a voltage drop proportional to [itex]\mathrm{d}^3 Q/\mathrm{d}t^3[/itex] (or any higher derivative). I can't think of any physical reason why one couldn't exist. But I'm not an expert on circuit components.
 
  • #3


I would like to clarify that there is no such thing as a "fourth" voltage drop. The concept of voltage drops is based on the three fundamental properties of a circuit - resistance, capacitance, and inductance. These properties determine how a circuit responds to changes in current and voltage.

The equation for voltage drop is V=IR, where V is voltage, I is current, and R is resistance. This equation holds true for all types of voltage drops, whether it is capacitive, resistive, or inductive.

In the case of capacitive voltage drop, the voltage drop is directly proportional to the charge (Q) stored in the capacitor. In resistive voltage drop, the voltage drop is directly proportional to the change in charge over time (dQ/dt). In inductive voltage drop, the voltage drop is directly proportional to the change in the rate of change of charge over time (d(dQ/dt)).

There is no need for a "fourth" voltage drop as the three existing types of voltage drops cover all possible scenarios in a circuit. The concept of "opposing electric fields" acting against acceleration is already accounted for in the equations for inductive voltage drops.

In conclusion, there is no need for a "fourth" voltage drop, and the theory behind this is based on the fundamental properties of a circuit and the equations that govern them. Any additional voltage drops would be redundant and not based on scientific principles.
 

1. What is the significance of voltage drops based on Q, dQ/dt, and d(dQ/dt)?

The voltage drop is a measure of the decrease in voltage between two points in a circuit. It is influenced by the charge (Q) passing through the circuit, the rate of change of charge (dQ/dt), and the rate of change of the rate of change of charge (d(dQ/dt)). These factors affect the flow of current and can lead to changes in voltage.

2. How does d(d(dQ/dt)) affect voltage drops?

The third derivative, d(d(dQ/dt)), is a measure of the rate of change of the rate of change of the rate of change of charge. This can occur in circuits with non-linear elements and can lead to fluctuations in voltage drops. It is important to consider this factor when analyzing complex circuits.

3. Can voltage drops based on d(d(dQ/dt)) cause damage to a circuit?

In most cases, voltage drops based on d(d(dQ/dt)) are small and do not cause damage to a circuit. However, in circuits with sensitive components, these fluctuations can cause voltage spikes that may damage the components. It is important to design circuits with appropriate protection measures to prevent damage.

4. How can d(d(dQ/dt)) be measured in a circuit?

Measuring the third derivative, d(d(dQ/dt)), requires specialized equipment and techniques. It is usually measured by taking multiple readings of the voltage drop over time and using mathematical calculations to determine the rate of change of the rate of change of the rate of change of charge.

5. Are there any practical applications of considering d(d(dQ/dt)) in circuit analysis?

In certain cases, considering the third derivative, d(d(dQ/dt)), can be useful in circuit analysis. For example, in circuits with inductors, this factor can affect the rate of change of current and lead to changes in voltage. It can also be used in the design of filters and oscillators to tune the circuit for specific frequencies.

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