Power Supply Voltage

[skarul.eee]

What exactly is the difference between a 110v and a 220v labeled power outlet. As far as i can see, the outlet is just a piece of plastic with some metal connecting to the power cables? Does it pose a problem to mount a 110v power outlet on a 220v power cable? Both types of outlets seem to be identically build. To clarify, the plugged in devices are using 220v as the power system provides, the question is really just about the power outlet itself.

[didarul alam]

Thanks for sharing