Convert External HD from PC to Mac

I have an external hard drive hooked up to a PC. I no longer use the PC and would like to use the external HD with this iMac. I have a feeling that it will not work because it's probably formated for the PC. How can I make it work with the iMac.
Can I just plug it into the USB port and reformat it? If so, how do I configure it to re-format it?

Hello and Welcome to Apple Discussions. 
I've never used a MacBook Pro nor TimeMachine so you may be best to ask in a more relevant forum.
Windows can't read HFS+ drives by default but the application MacDrive (link) will enable them to do so. Clearly you can't install this on the PCs at school.
Also TimeMachine takes up large amounts of space so I would serious recommend purchasing different drives for these two distinct purposes.
In fact, for transferring a few files between school and home a USB Thumb Drive formated in FAT32 (can be write/read by both) is probably more than enough.
cheers
mrtotes

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