Electrodes used to make electrical measurements of the body (such as those used

Question

Electrodes used to make electrical measurements of the body (such as those used when recording an electrocardiogram) use a conductive paste to reduce the skin resistance to very low values. Great care must be exercised when a patient is wearing such electrodes. If a patient is wearing one such electrode on each wrist, what is the minimum AC voltage that could provide a potentially fatal shock? A fisherman has netted a torpedo ray. As he picks it up, this BIO electric fish creates a short-duration 50 V potential difference between his hands. His hands are wet with salt water, and so his skin resistance is a very low 100 omega, current passes through his body? Will he feel this DC?

Explanation / Answer

27.

current = potential difference / resistance = 300 / 1000 = 0.3 A

29

Potential difference = 50 volts

resistance = 100 ohm

current is given as

current = Potential difference / resistance = 50 / 100 = 0.50 A

yes he can feel this pulse

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