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40 amp fuse with a 12 volt current


The amp is the unit of current, not the volt. Volt is the unit of potential.

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40 amp fuse and 12 volt power


The unit of power is the Watt, not the volt.

Can you make up your mind on which quantity you are using the volt to define.

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In the "theory" i always use fuse ampage multiplied by 12 volts as the output to the theory is usually a very similar figure to the manufacturers rms rating at 14.4volts.


You are quoting (badly) the definition of instantaneous power, P = VI. A fuse will not blow at a given instantaneous power rating, otherwise the fuses of every electrical device on this planet would blow when they briefly attempt to consume more current than the fuse is rated at - for example, when you turn the volume up too high. However, the instantaneous power developed by any device does not depend upon it's fuse rating down (or indeed, up) stream. Fuses only indicate a desire to prevent say, a fire, in the event a device continues to consume power in a short-circuit condition which is likely to melt or burn it's casings or insulation.

A conventional lead-acid battery in good condition will have a 14.4V potential across 6 cells. 12 Volts is a notional "standard" battery voltage used by manufacturers based on a 2V per cell Pb-Acid cell electro potential.

These figures have nothing, other than co-incidence, to do with the calculation of RMS or Peak/absolute power figures. By the way, the square root of 2 is 1.414.

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the internet seems to be full of people who hear a interesting theory and instantly say that its BS, when they cant be bothered to actually spend the time to try out the theory, and lets face it they have the ability to find out wether or not it true using nothing but their mouse, fore finger and google.


This BBS seems to be full of qualified electronics engineers who know the theory already and do not need to use Google to come up with the design for the empeg players that this BBS supports.
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One of the few remaining Mk1 owners... #00015