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Answers: I was watching a video clip of an episode of Rescue 911 on YouTube and paramedics were doing that

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It conducts the electricity. This helps to prevent the burns that a patient would recieve from the current. The gel also is used for diagnostic test such as ultrasounds, which improves the visual reading the examiner is viewing

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It conducts electricity. The jelly makes a solid contact with your skin, and with the paddles. Without the jelly, the electricity would arc, and you'd have severe burns.

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better connection

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The jelly allows a larger area of contact. The larger area spreads the current and keeps it from localizing, which could cause spotty burns. As a larger area is available, with improved contact, the amount of current used can be more closely regulated.
Its all about control.

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