In a monopolar setup, which electrode is typically the active one?

• A. The larger dispersive electrode
• B. The smaller active electrode
• C. Both electrodes are equally active
• D. Neither is active

Answer: (C)

In a monopolar setup, one electrode delivers the stimulation while the other serves as a return path. The electrode that actually delivers the therapeutic effect is the smaller one placed over the treatment area, because concentrating the current in a smaller area increases the intended stimulus at that target. The dispersive electrode is larger to spread the current over a wider skin area, which lowers current density at the return site and helps prevent skin irritation or burns. So the active role isn’t shared—it's the small electrode over the treatment site, with the large dispersive pad handling the return.