There is no "iMac Air".
The iMac G3 was released in 1998.
The first iMac was made in 1998.
Apple
They are manufactured in China.
Plastic
Steve Jobs
The first on was introduced in 1998.
No. You can only play games made for Mac OS on an iMac.
One can see old iMac Commercials in Youtube which features the different types of commercial about old iMac such as All Mac vs. TV adds, Apple iMac vs. HP, and iMac G3 starting up.
You can plug up your 2012 iMac when you are finished using it. Nothing will happen to the iMac. After the iMac is fully charged, make sure to unplug it.
it was originally made in California but now, like all computers it is made in China.