31 Jul
2001
31 Jul
'01
6:59 a.m.
On 31 Jul, Bill Bradford wrote:
How can a normal PC XT power supply deliver 25-30A,
when its plugged
into a normal 15A wall socket? Or is the amperage way different in
the UK?
Ahhhmmmm. Yes. ;-)
The current by itself is not important, you have to see it in relation
to the voltage. This means you can suck a given amount of _power_ out of
a wall socket. Power = current * voltage. So you will get with 230V and
15A a power of 3450W out of the wall socket. A power supply is a device
that transforms a (usual) higher (AC) voltage into a lower (DC)
voltage, thus increasing the current, as the power is constant. So you
will get 690A at 5V if you max out the _power_ capacity of a wall socket.
But you have also to consider, that the internal components in a power
supply will limit the amount of power that can be transported through
the power supply. As the output voltage is fixed at 5V (or 12V or what
ever) the limitation applies to the current.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/