Since this is a circuits course, I assume they would use a circuit simulation.
I personally think this is the best circuit simulation to learn the basics of college level analog and digital circuits (it is animated), but I highly doubt the MIT course will be using it: http://falstad.com/circuit/
I used a customized version of it in my own research, and within minutes engineering students (who had already finished their intro circuits classes but still showed misconceptions) were better understanding the behavior of circuits: http://usu.academia.edu/edtechdev/Papers/161483/Designing_An...
I personally think this is the best circuit simulation to learn the basics of college level analog and digital circuits (it is animated), but I highly doubt the MIT course will be using it: http://falstad.com/circuit/
I used a customized version of it in my own research, and within minutes engineering students (who had already finished their intro circuits classes but still showed misconceptions) were better understanding the behavior of circuits: http://usu.academia.edu/edtechdev/Papers/161483/Designing_An...