Fig. 2

Pulsed electrical current can have many different shapes and waveforms. A Examples of monophasic waveforms above the zero baseline. A pulse above the baseline is said to have a positive polarity and a pulse below the baseline is said to have a negative polarity. Examples of biphasic waveforms. The pulse crosses the zero baseline to appear both above and below the baseline. The pulse shape may be B symmetric and charged-balanced or C asymmetric and/or charged unbalanced