Carl Lowenstein wrote:
>
> Some laptops must be made to tolerate at least a 50% variation in
> input voltage, since they can run from either 6-cell or 9-cell battery
> packs.
But would you be willing to apply 150% rated voltage to any random
electrical device?
I would be willing to use a powersupply rated for 150% or even 1500% the
devices rated current or wattage requirements. Not so voltage, nor
polarity.
The powersupply's current/wattage rating is a measure of what it can
safely produce. What it actually produces is sole depentent upon the
load applied. In the case of a 10A powersupply and a 1A load, there
will be only one am drawn, perfectly within the tollerances of the
powersupply. If you reverse that, and you put a 10A load onto a 1A
powersupply, and something s going to fail. You will release the
magic blue smoke, if you are lucky. You will release the magic
orange flames if you are unlucky.
This is why it is safe to use a powersupply that is overrated in
apmerage/wattage _provided that_ the voltage, type (AC, DC), phase
rotation (AC), frequency (AC), and polarity (DC) are all correct.
This is true for any random device.
Some devices can tollerate changes in voltage, polarity or phase
rotation (etc). I would not rely upon it.
-john
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