The electric ray has a strange electrical discharge organ inside its body that can generate a strong voltage outside the body. This electric appliance is distributed in the electric ray's chest and abdomen on both sides, looks like two flat kidneys, is composed of many honeycomb cells, they are arranged in a hexagonal cylinder, called the "electric plate" column. Electric ray body **** there are 2,000 electric plate column, there are 2 million "electric plate". These electric boards are filled with gelatinous substances, can play an insulating role. Each "electric plate" surface distribution of nerve endings, one side of the negative electrode, the other side for the positive electrode. The current flows from the positive to the negative electrode, that is, from the back of the ray to the belly. Under the action of nerve impulses, these two electrical dischargers can turn nerve energy into electrical energy and discharge electricity. A single "plate" produces a very weak voltage, but in large numbers it can emit a very strong voltage.

Each of the electric plates of the electric ray is simply a metamorphosis of a muscle fiber. The generating organ evolved from certain gill muscles, and in the process of evolutionary genesis relieved the gill muscles of their original office, and assumed a new role - the generation of electricity.

The most important pivot of the generator is the nerve part of the organ, and the electric skate is capable of discharging electricity at will, and the time and intensity of the discharge, which it is fully capable of mastering on its own. Electric skate can also according to their own needs, in a period of 10 to 16 seconds, 150 times per second discharge, each discharge voltage of 80 volts. South American electric skate discharge voltage is smaller, only 38 volts. The largest electric ray in Africa produces 220 volts and 3,000 watts of power, enough to kill a large fish.

Electric rays use electricity-generating organs to kill or paralyze their prey. Two electric rays caught in the Tees estuary had a 900-gram eel and a 450-gram plaice in the stomach of one; the other had a salmon weighing more than 2,200 grams. All of these prey fish had scars on their bodies. The electric rays emit currents of varying strengths, which are related to the size of the ray and the number of electric plates. When a person accidentally steps on an electric ray at the bottom of the ocean, it emits enough electricity to electrocute an adult.