Okay, I need a new speaker for my amp and I've figured out about making sure the OHMs are okay now I need to know about wattages. I've got a 40 watt amp. All the speakers I've looked at are at minimum 75 watts RMS handling. My first question is can I put this in my amp and not put a whole lot of stress on my amp? What is RMS? Thanks for you help guys.
Oh you can no doubt about it man

It's a good idea to have a little higher wattage speaker then your amp is.