What Windows PowerShell commands should you use to create a simple volume of the same size on disk 3 using the drive letter G:?

The solution for this problem is

Create a new partition on disk 1

PS C:/> New-Partition - DiskNumber 1 - UseMaximumSize - AssignDriveLetter

This command lets you create a new partition disk and the same time uses the maximum available space as well as the automatically assigning it into a drive.