A television camera is very different from an ordinary camera in many ways. In an ordinary camera, images are captured on film. A television 
camera, on the other hand, produces pictures as electrical signal.A picture tube or chip in the camera produces an electrical current called the video signal. This signal varies according to the amount of light in the image. In the case of colour TV, there may be two or three tubes. Special filters split the light into the three primary colours, red, green and blue. The camera thus produces three signals which are combined into a signal video signal that is transmitted.
