Before you go through the effort of investing "only" 4-6 weeks in the EMT I class, be sure to check if there is somewhere nearby that you can work or volunteer.
In my home town, volunteering was easy, but here in the town where I attend college, all EMT services are handled by the fire dept. This means that you have to train as a fireman (another healthy time investment), and work as a fireman (or volunteer), and you might get to go on a few EMS calls. In short, it stinks.
So make sure you have somewhere you can use the certification. If you attend a larger college, many have their own EMS teams, though they are usually volunteer. Paramedic schools, by the way, are usually quite a bit longer (2 years? not sure). Sort of like getting your basic RN.