In this animated lesson, students read an analogy comparing water in a "special" water tank to the current "flow" through a capacitor.

In this interactive learning object, the learner practices sizing a tank-type water heater for one- and two-family residences, townhouses, and apartments with individual water heaters.

In this animated object, learners examine the parts of a pneumatic power system, including the prime mover, compressor, and receiver tank, and how they function.

Learners study the operation of capacitive probe sensors used to measure levels in a tank.

In this animated object, learners study how displacement level sensors are used to measure the level of liquid in a tank.