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Old Saturday, November 13, 2010
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Default Physics Question !!!
Q1. suppose we have three identical TV (cathode ray type) sets each having same specifications.

tv#1 is mute and showing a fully red colour screen .

tv#2 is mute and showing a fully blue colour screen .

tv#3 is mute and showing a fully green colour screen .


if all the conditions ( input signal power , noise , voltage ,room temp. & humidity) and other external factor are same for all .
then , which television set will consume most power and which one will consume the least?
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Old Saturday, November 13, 2010
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Originally Posted by bear View Post
Q1. suppose we have three identical TV (cathode ray type) sets each having same specifications.

tv#1 is mute and showing a fully red colour screen .

tv#2 is mute and showing a fully blue colour screen .

tv#3 is mute and showing a fully green colour screen .


if all the conditions ( input signal power , noise , voltage ,room temp. & humidity) and other external factor are same for all .
then , which television set will consume most power and which one will consume the least?
blue!!!....green and red fall below blue in frequency spectrum....blue has the highest frequency of all thus the most energy...therefore the TV producing these lights also consume a lot of energy...remember *Energy cannot be created nor destroyed but it can be converted from one form to another* ...i hope this serves the purpose..!!

ADdition: Red will consume the least, followed by Green...

Remember the rule "ROYGBIV (red, orange, yellow, green, blue, indigo, violet)" ...energy is from the least to the most..Violet has the most energy!!!
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Old Sunday, November 14, 2010
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it means the instantaneous power of tv depends on RBG.

and for calculation of maximum power for a TV( excluding speaker's power as muting the speakers means they are consuming standby power which is very low just to keep sound system alive ) you must connect an ammeter (series) and voltmeter or oscilloscope ( parallel ) while providing such a signal that gives all pixels blue.


right ?
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Old Sunday, November 14, 2010
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it means the instantaneous power of tv depends on RBG.

and for calculation of maximum power for a TV( excluding speaker's power as muting the speakers means they are consuming standby power which is very low just to keep sound system alive ) you must connect an ammeter (series) and voltmeter or oscilloscope ( parallel ) while providing such a signal that gives all pixels blue.


right ?

you do not provide such a signal...you provide the right amount of energy to the CRT that will produce the blue signals...

to calculate power, its possible if you knw any of the following:

Voltage across the CRT, Current Across the CRT, Resistance of the CRT.
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