In this animated activity, learners read an explanation of the four different modalities (currents) used in electrotherapy.

Students view the mathematical expression of an AC waveform with respect to time (t) and read about the different components of this expression.

Students view the mathematical expression of a sinusoidal waveform with respect to time (t) and solve five problems. The answers are provided so students may check their work.

The learner will be able to represent steady-state AC sinusoidal signals using phasors, which will lead to a simplified technique of analyzing AC circuits in a very similar way that we analyze DC circuits.