A voltage of about 800 volts can electrocute a person, while a voltage of about 300 volts can't. The electric eel is one of the "most feared freshwater animals on earth". The electric eel is one of the most feared freshwater animals on the planet, and most electric eels can only emit a voltage of about 300 volts, which will only cause the human body to feel very numb, and will not cause death. The American electric eel can release more than 800V voltage, so strong enough to kill a cow, so the release of about 800 volts of voltage can electrocute people.