Stimulus on/off time describes:

• A. The percentage of total time the device is on
• B. The duration the machine delivers current and the duration it is off
• C. The pulse width
• D. The energy delivered per second

Answer: (B)

Stimulus on/off time describes the rhythm of the electrical delivery: how long the current flows during each burst and how long it rests between bursts. This is the pattern that creates the pulse train. The best way to think about it is that the on duration is the time the machine is delivering current, and the off duration is the time between bursts when no current flows. This timing is different from the single-pulse duration (pulse width), which is how long one individual pulse lasts within the on period. It’s also different from energy per second, which relates to how much energy is delivered overall, not the on/off timing. For example, on for 0.5 seconds and off for 0.5 seconds means a 1-second cycle with a 50% duty cycle.