help!!!!!!!?

Question

can anyone describe please! the energy conversion of a television?

thank you!!!!!!!!!!!!!!!!!

Answer 1

It seems a bit more complete answer is in order.
The tv has a cord that plugs into the wall. This is the primary energy source for the TV, which is 120v AC, 60HZ, also known as common household current.

This enters a power supply stage that transforms the 120v current into low voltage DC, 5 V, and sometimes 1.2 V for the digital logic. Also, there is 48V DC and other voltages for the analog circuitry.
Then there is the high voltage for the CRT display.
All of the transformers are less than 100% efficient, so there is heat lost in the power supply stage.

The TV recieves radio frequency, or RF, signals from the connections to the antenna or cable. This is very low power compared to the TV itself. The RF contains the information modulated with the RF signal for the picture, sound, and other information depending on the sophistication of the set. Irregardless, think of this as the input signal.

There is analog circuitry that demodulates the signals using freuency filters, both passive and active. This uses the mediium voltage and finishes with the low voltage. The power is consumed by the impedance from positive to ground, and by transistors switching current to ground. Once demodulated, the brain of the TV is about amplification and control. These use active devices, transistors, for the logic which operate in saturation mode, or in high impedance mode. They spend very little time in transistion. Basically charging and discharging capacitors at the frequency of the master clock. The low voltage DC is used for this purpose.

The audio goes to an amplifier that generates an AC signal to drive the speakers. Again, transistors sourcing current to ground. The speakers are inductive devices that convert the AC current to mechanical motion, or throw of the speaker cone, which transmits sound in the air. The sound then dissipates as heat.

The video goes to a high voltage amplification stage that drives the "guns" of the CRT. This energy produces a high energy ionic stream that interacts with the material on the surface of the screen to create colors in individual pixels. LCD and Plasma work differently, but with the same visual result, more or less. Much more energy is used to drive the ionic stream than the light transmitted from the screen. The ionic stream generation creates a great deal of heat in the windings of the CRT. There is also heat loss as the chemicals are excited by the stream and then relax.
The transmitted light is absorbed and converted to heat by the room, couch, clothes, etc.

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Answer 2

There's two different inputs of energy and at least four different outputs. The TV consumes electrical power to operate. This is combined witht eh radio frequency electromagnetic energy to produce: light, sound, heat, and electromagnetic energy.

The TV takes radio frequency electromagnetic energy (the broadcast signal) and turns it into light (picture) and sound (audio) energy. It also creates some radio frequency electromagnetic energy and heat due to inefficiencies in the electronics.