How much amperage is lethal to a person?

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Multiple Choice

How much amperage is lethal to a person?

Current through the body determines how dangerous an electric shock is, and the heart is especially vulnerable to current. While you might feel a small tingle at only a few milliamps, lethal effects through the chest typically arise as the current increases into the tenths of an amp range and above. A commonly cited threshold for lethal risk is about 0.33 amp (one-third of an amp). At about this level, especially with alternating current, the heart can go into ventricular fibrillation, which can be fatal if not treated immediately. So the option that states roughly 0.33 A reflects the practical danger level used in many safety guidelines. Keep in mind that many factors influence the actual outcome—the path the current takes through the body, how long the exposure lasts, skin resistance, and whether the current is AC or DC. Those factors can shift the exact lethal point, but the 0.33 A figure is a standard benchmark used to emphasize why even relatively small currents can be deadly in electrical exposures.

Current through the body determines how dangerous an electric shock is, and the heart is especially vulnerable to current. While you might feel a small tingle at only a few milliamps, lethal effects through the chest typically arise as the current increases into the tenths of an amp range and above. A commonly cited threshold for lethal risk is about 0.33 amp (one-third of an amp). At about this level, especially with alternating current, the heart can go into ventricular fibrillation, which can be fatal if not treated immediately. So the option that states roughly 0.33 A reflects the practical danger level used in many safety guidelines.

Keep in mind that many factors influence the actual outcome—the path the current takes through the body, how long the exposure lasts, skin resistance, and whether the current is AC or DC. Those factors can shift the exact lethal point, but the 0.33 A figure is a standard benchmark used to emphasize why even relatively small currents can be deadly in electrical exposures.

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