Timeline for Is the meaning of a decibel different when applied to voltage vs watts?
Current License: CC BY-SA 3.0
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| Mar 15, 2015 at 13:43 | history | edited | Olin Lathrop | CC BY-SA 3.0 |
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| Mar 13, 2015 at 19:56 | comment | added | supercat | When examining amplifiers, filters, etc., impedances are often ignored not because they're unknown but because the amount of power actually dissipated in part of a circuit is small and not of interest. If an amplifier's input impedance drops by a factor of two with each doubling of input frequency, but the input impedance is 10M at 1KHz, a 10KHz 1V signal would require more power than a 1KHz 2V signal, but in most cases the fact that the latter signal has twice the voltage would often be significant; the fact that the former requires feeding twice as much power would not. | |
| Mar 13, 2015 at 18:55 | history | answered | Olin Lathrop | CC BY-SA 3.0 |