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It depends... If the voltage were applied externally, like to fingers or toes, etc. basically nothing. If the voltage were applied to the tongue, you would feel a tingling sensation, nothing more. If it were applied with electrodes inserted through the chest directly to the heart muscle, it could stop your heart, killing you! It's not the volts that cause damage or pain, its the amps. The higher the voltage, the higher the amps. Also, if the electrodes touch moist tissue such as your tongue, the saline moisture conducts better, causing higher current. If the current gets high enough, tissues start to heat, and enough can cause tissue destruction. 7.5 volts is not high enough to do that, given the resistance of human tissue. But, even low current, if it flows through a muscle, can cause the muscle to contract uncontrollably. This is why even a small current through the heart is trouble. Unless you deliver the current directly to the heart muscle, it takes much higher voltage. If you grab an electrode with each hand, for instance, some current would flow through the heart, but because the skin resistance is so high, it takes several dozens of volts before the heart would be endangered.

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Q: What would 7.5 volts do to a person?
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