The Relationship between Voltage and Energy

Energy is proportional to voltage squared. If we make the assumption that a variable voltage is being fed to a constant load-resistor, then with voltage, current would increase, and current would get multiplied by voltage again, to result in energy.

Sound energy is proportional to sound pressure squared. With increasing sound pressure, minute displacement / compression of air results, which causes displacement to rise, and displacement times pressure is again – energy.

The decibel scale is in energy units, not pressure units. Therefore, if a voltage increases by the square root of two, and if that voltage is fed to a constant load, then energy doubles, which is loosely expressed as a 3db relationship. A doubling of voltages would result in a quadrupling of energy units, which is loosely described as a 6db relationship.

Something similar happens to digitally sampled sound. The amplitudes of the samples correspond roughly to the Statistical concept of Standard Deviation, while the Statistical concept of Variance, corresponds to signal-energy. Variance equals Standard Deviation squared…


I should add that this applies to small-signal processing, but not to industrial power-transmission. In the latter case, the load resistances are intentionally made to scale with voltages, because the efficiency-gains that stem from voltage-increases, only stem from keeping current-levels under control. Thus, in the latter case, higher amounts of power are transmitted, but without involving higher levels of current. And so here, voltages tend to relate to power units more-or-less linearly.

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About Why the output of a Laser is so Wavelike

The subject of wave-particle duality continues to mystify commoners, while the ultimate explanation given by experts, who need to be schooled in Quantum-Mechanics for years, before they are exposed to these secrets, seem to defy some common-sense reasoning. More specifically, the way in which Quantum-Mechanics mainly explains it, is that the wave-phenomena, specifically those that take place in a vacuum, only exist as being secondary to the existence of particles. We think we can see many examples in our practical world, where waves ‘seem real’.

One such example is the beam of light output by a Laser, that is both monochromatic and coherent, that is highly parallel, and that only seems to make its wave-nature obvious. It is this ultra-high consistency of the wave-nature of a Laser-beam, that also makes it useful for creating holograms – aside from the fact that the beams output from these devices have many more uses today.

But in a way that might disappoint some skeptical thinkers, this nature of the light output from a Laser is actually predicted by Quantum-Mechanics, and fails to provide a contradiction to it. And I will explain why.

Quantum Mechanics is largely built around the Heisenberg Uncertainty Principle, although Heisenberg did not dare to assign complex numbers to his probability clouds yet. Those probability clouds are supposed to represent the superposed states of a particle, with the additional detail that they can be phase-shifted according to understanding today, which means that they seem to conserve a two-component number – i.e. a complex number.

What the uncertainty principle seems to state, is that the precision with which the position of a particle can be known, is inversely proportional to the precision with which its momentum-vector can be known, and vice-versa.

Photons are understood to have momentum vectors, even though when the photon-energy is low, such as for visible light, that momentum-vector also has low magnitudes. But the momentum-vector of a photon is supposed to follow entirely from the direction-vector it is traveling with, as well as being inversely proportional in magnitude, to its wavelength. The energy of the photon is also inversely proportional to its wavelength.

Because of the nature of the light output by a Laser, all the variables needed to know the momentum-vector of its photons are known – and are exactly equal. So the precision of their momentum-vectors is actually zero – i.e. their momentum vectors should have a variance of zero, based on the fact that they are parallel and fully monochromatic.

And so it would only seem to follow from the Uncertainty Principle, that the variance with which their position-vectors should be knowable, should be off-the-scale. By that logic, the position-vector of any one photon in the beam, cannot be knowable.

And so we seem to obtain a beam of light, only the wave-nature of which is knowable.