Does changing the volume on on TV change how much energy it uses?

Yes, it does. Below is the explanation:

The TV set receives the encoded or modulated sound signal (along with the video) through its input port (usually antenna or Video-In). The signal level is usually very low (in mili volt). After decoding or demodulating the signal, it must be amplified before it can be fed to the TV speakers. An amplifier inside the TV takes this demodulated signal as reference for amplification. For simplicity you can assume an amplifier has two inputs and one output. One is the reference signal which is to be amplified, and the other is a current source (from the “power supply unit” of the TV), that will be multiplied with the reference signal. The product of these two is the Output of the amplifier. This output signal is finally applied to the TV speakers.

Now when we increase or decrease the volume on the TV, the controlling circuit of the TV increases or decrease the 2nd input power of the amplifier from the power supply unit. Total power consumed by the TV is simply the power consumed by the power supply unit, which in turn depends on the amount of power consumed by the different subcomponents in the TV to which the power supply supplies power (for example: Display unit, Audio unit including the amplifier). So if we decrease the volume on the TV, the amplifier will use less power from the power supply unit and the total power consumed by the TV will be less, on the other hand, if we increase the volume the amplifier will take more power from the power supply unit and the total power consumed by the TV will be more.

This way, changing the volume on TV change the amount of energy it uses.

Yes, increasing the volume of your TV does make it consume more electricity though it is not very significant because the speakers in most of the TV are not HIFI speakers and their wattage is very low compared to most of the Music Systems.

Also changing brightness/contrast in a CRT doesn't have much effect but it definitely has effect of change in electricity consumption in LCD TVs.

yes... but the effected rate is not too much... actually you must did some experiment.

if you know basic electronic that volume tv = viriable resistor,

so, energy = power = voltage x current = current^2 x resistance.........

what ever electric / electronic equipment has thier own resistance to control speed, dim or etc and this will effect whether increase or dicrease the energy of electric.

just opinion.. plz refer your lecture / teacher.. TQ

Simple answer: Yes

There are complex answers already, but if you think about it, making more sound will always take more energy. This applies to electronics, as well as acoustics.

If you turn the volume up, you will use more energy.

Yes. If you connected a watt meter to your TV and read the power you would see changes with volume and the amount of light that it made.

Are you putting forward that in case you do not take the oxycodone then all you do is sleep? Is the oxy providing you with skill or something? you ought to particularly talk on your well being care provider about all of this, it appears like you want something to assist your leg yet when the oxy is causing you issues then possibly he/she might want to prescribe you something else.

The sound amplifier consumes more power as output (volume) is increased. You are making bigger soundwaves in the air which requires more force, which is provided by the amplifier. Power in = power out, so you cant make bigger sound waves without putting more power behind them

Those people are just guessing, so don't feel too bad. It seems likely that it would be true, but have they analyzed the circuits or done the measurements? No, I don't think so.

Hmmm but what about if you turn up the color? Or the contrast?

Wow i was going to make some smart *** comment on how it doesnt but then i read the other answers. I guess you learn something new everyday.

Yes, but minutely.