A terrific tool in teaching exposure is a 4x5 camera, a Polaroid back, a bunch of Type 55 P/N film, and a light box. Students get an instant and engaging demonstration of what might otherwise be vaguely understood words. A favorite exercise of mine when I was teaching was to ask the students how the appearance of negatives made of the following subjects would differ: full frame shots, metered throught the lens, of black, white, and gray poster board. Knowing what a meter is up to goes hand-in-hand with understanding exposure.
I just found this website, so excuse this long-belated reply. njb