Exam-style question
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Why are ECG electrodes often coated with a conductive gel?.
- A.To increase the skin’s temperature.
- B.To reduce the skin’s electrical resistance and improve contact.
- C.To make the electrodes more visible.
- D.To protect the electrodes from corrosion.
Model answer
What a good answer should say
- To reduce the skin’s electrical resistance and improve contact.
Explanation
Why this works
Conductive gel fills gaps between the electrode and skin, lowering resistance and ensuring a stable electrical connection, which is essential for accurate signal detection.
Common mistake
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