With fingers.
no
You can't use mods on Mac or iMac, it only works on PC.
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.
When running and not in sleep mode the 21.5" iMac uses 205 watts of power. The 27" iMac uses 310 watts. In sleep mode they each use around 2 watts.
Anyone who can use a Windows PC.
Yes
And exactly what is "at" that you are referring to.
About 1.75"
yes its the same as a pc.
If it has a television capability.
No, you cannot directly use an iMac as a display for a Mac Tower G5. While some iMac models support Target Display Mode, this feature only works with certain iMacs and requires a compatible Mac to connect. The G5 does not have the necessary video output options to utilize this feature. To use the iMac as a screen for the G5, you would need a separate capture device or software solution.
Yes, as long as your iMac has Mac OS9 or higher.