dudeguy said:
what would happen if a 24volt 1000mA power supply was used to power an
18v device?
Anywhere from nothing, to apparently normal operation, to
destruction of either the supply or the device or both.
The supply may have internal protection (to protect itself)
and shut down without damage, so it appears as if nothing
happens; the device may have internal regulation, so operation
appears normal (but excess heat will be produced which
can bring about eventual failure); the device may draw well in
excess of 1000 mA, ruining either itself, or the supply, or
both, with outward symptom of anything from non-operation to
smoke and meltdown.
In other words, don't do it.
Ed