Which parameter defines pulses per second?

• A. Amplitude
• B. Pulse duration
• C. Duty cycle
• D. Frequency

Answer: (D)

Pulses per second are defined by frequency. Frequency measures how often each pulse train repeats in one second, and it’s expressed in hertz. The higher the frequency, the more pulses occur each second.

Amplitude is about how strong each pulse is, not how often pulses occur. Pulse duration refers to how long a single pulse lasts, while duty cycle is the fraction of time the current is on during one cycle. So frequency specifically captures the pace of stimulation, not its intensity, length, or on-time proportion.