Some eels also shock other animals who might accidentally come into contact with them. That is why they sometimes shock humans. If we are in their living area or if we scare them then they might shock us. However their shock is only strong enough to knock a human down, not kill us. Electric eels do not shock each other because they don't want to eat other eels and they don't usually get attacked by other eels, which are the main reasons eels shock animals.
Electric eels can fatally electrocute a horse.
This organ is composed of 5000-6000 elements, arranged like a dry battery. The head acts as the positive pole of the battery, the tail as the negative pole. When the eel is at rest there is no generation of electricity, but when it starts to move it emits electrical impulses at the rate of about 25 hertz. During intense feeding discharges of up to 50 hertz have been recorded. These discharges aid in locating food and navigation, as well as the killing of prey.