What amperes of electricity is sufficient to injure or kill a person?

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Multiple Choice

What amperes of electricity is sufficient to injure or kill a person?

Explanation:
Current through the body is what determines injury risk. When electricity crosses the chest, it can disrupt the heart’s rhythm. That disruption can occur with currents around a few tenths of a ampere, and a typical dangerous threshold is about 0.33 A (one third of an ampere) for alternating current. If a person is exposed even briefly at this level, ventricular fibrillation is a real danger, which can be fatal without quick treatment. The exact outcome also depends on the path the current takes through the body, the frequency of the current, and how long the contact lasts. Smaller currents, like around 0.1 A, can cause painful shocks or muscle contractions but are less reliably lethal. Larger currents, such as 1 A or 3 A, are extremely dangerous and carry high risk as well, but the value around 0.33 A is commonly cited as a threshold where harmful effects become likely.

Current through the body is what determines injury risk. When electricity crosses the chest, it can disrupt the heart’s rhythm. That disruption can occur with currents around a few tenths of a ampere, and a typical dangerous threshold is about 0.33 A (one third of an ampere) for alternating current. If a person is exposed even briefly at this level, ventricular fibrillation is a real danger, which can be fatal without quick treatment. The exact outcome also depends on the path the current takes through the body, the frequency of the current, and how long the contact lasts.

Smaller currents, like around 0.1 A, can cause painful shocks or muscle contractions but are less reliably lethal. Larger currents, such as 1 A or 3 A, are extremely dangerous and carry high risk as well, but the value around 0.33 A is commonly cited as a threshold where harmful effects become likely.

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