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. Use the data shown in table below and (Figure 1). If a patient is wearing one such electrode on each wrist, what is the minimum AC voltage that could provide a potentially fatal shock? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

From the figure 310 resistors are in series .

it is given that paste is added to the skin so 290 need not be calculated

an additional resistance 30 can be taken to calculate total resistance

total resistance R = 310+310+30= 650

Fatal voltage V=iR=(100*10-3 A) * (650) = 65 V

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