function Get-Resources{  
    param(  
    $computername =$env:computername 
    )  

    $Info = "" | Select ComputerName,Memery,DiskSize,FreeDSize
    $info.ComputerName = $computername

    # Processor utilization 
    # $cpu = gwmi win32_perfformatteddata_perfos_processor -ComputerName $computername| ? {$_.name -eq "_total"} | select -ExpandProperty PercentProcessorTime  -ea silentlycontinue  
    
    # Memory utilization 
    (get-wmiobject -class "win32_physicalmemory" -namespace "root\CIMV2").Capacity | %{$Memory += $_ }
    $Memory = [math]::Round($Memory/1GB, 2) 
    $info.Memery = $Memory

    # disk space 
    $disks = get-wmiobject -class "Win32_LogicalDisk" -namespace "root\CIMV2" -computername $computername | ? DeviceID -EQ 'C:'
    foreach ($disk in $disks)  
    { 
        if ($disk.Size -gt 0) 
        { 
            $size = [math]::round($disk.Size/1GB, 2) 
            $Info.DiskSize = $size
            
            $free = [math]::round($disk.FreeSpace/1GB, 2) 
            $info.FreeDSize = $free
        } 
                       
    } 
     return $Info
}

 Get-Resources -computername localhost