What is the energy transformation that takes place in a television?

Answer 1

Simple answer: Electrical energy comes in and heat, light and sound energy goes out.

There are two input sources, the electromagnetic signal that is the actual information of what is to be displayed and there is also the electric power provided to operate the television. Typically, the power comes from an electrical cord plugged into the electrical outlet on the wall and the signal is a cable from an outside source or an antenna.

The input energy is electrical energy to power the TV and the signal is electromagnetic energy.

The output of primary interest is the image on the screen which is light energy, so the television puts out light energy which is also electromagnetic energy.

The television may also produce sound, in which case there is sound energy put out.

In the process of making light and sound, the components of the television heat, so heat energy is put out.

Summary:

Input: Electrical energy enters in two forms, electromagnetic signal and electricity. The electricity is the far greater source of energy. The energy in the signal is tiny.

Output: Heat, light and sound exit the television. Heat is the largest and in excess of 90%. Sound energy will be substantially greater than the amount of energy contained in the light.