Energy density is the amount of power that can be stored ( in
for example capacitance) to be then consumed over time, whereas
power density is how much energy is consumed quickly like the
energy stored in a capacitance can be consumed very quickly.
Energy density is the amount of power that can be stored ( in
for example capacitance) to be then consumed over time, whereas
power density is how much energy is consumed quickly like the
energy stored in a capacitance can be consumed very quickly.
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The energy spectral density describes how the energy (or variance) of a signal or a time series is distributed with frequency.
You can read more in Wikipedia 'Spectral Density', but you will need good maths to understand it!
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Sound energy density or sound density is the sound energy per
unit volume (according to Wikipedia).
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Density would affect the speed in which the energy is
transferred.