Which type of electric current flows in one direction only and is used in galvanic electrotherapy devices?
a.Tesla high-frequency current
b.Alternating current (AC)
c.Faradic alternating current
d.Direct current (DC)
Explanation
Direct current (DC) is a constant, one-directional flow of electrons. Galvanic devices use DC because chemical reactions such as iontophoresis and desincrustation depend on a steady polarity.
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