Passive Care Exam 1 Electrical Stimulation Practice Test

Which statement best describes biphasic current direction?

The flow of electrons changes direction regularly The flow remains in one direction It never changes It stops after each pulse

Correct Answer:

The flow of electrons changes direction regularly

Explanation:

Biphasic current direction means the current reverses direction within a single stimulation cycle. You have one phase pushing charge in one direction, followed by a second phase of opposite polarity that reverses the flow. This two-phase structure balances the charge delivered to the tissue and the electrode, reducing net charge buildup and lowering the risk of tissue irritation or electrode wear. That’s why the description stating that the flow changes direction regularly best matches biphasic stimulation. If the current always moved in one direction, that would be monophasic; if it never changed, it wouldn’t describe biphasic direction, and stopping after each pulse doesn’t address the reversal inside the pulse.

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