Electromagnetic Radiation

One method by which energy is transmitted from one location to another. Radio and television signals, for example, reach us by electromagnetic radiation. When electric and magnetic fields oscillate back and forth at a high enough frequency, they extend out into space in the form of waves. These waves may be absorbed (received) at some distant point. Very little energy transmitted by electromagnetic radiation is lost, or used up, by the space between the point from which it is sent and the point at which it is received. Energy from the sun reaches the earth by electromagnetic radiation, and only a very small amount of this energy is lost in the empty space between the sun and the earth.