I mean the t.v still holds some charge in it once switched off,does this energy just disappear?
2006-11-21 21:19:21 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Physics
You are quite correct that once the TV is switched off there is a great deal of energy built up in the device.
How much depends on the type of TV and the size obviously.
Lets take a conventional TV with a Tube (a Cathode Ray Tube). Switching off the power at the wall plug would leave the following:-
1) There will be a small amount of electric charge on surface of screen, this will not amount to many Joules of energy though.
2) Electrical capacitors (or Cans as they are called) inside the TV will be charged up. These may slowly leak their charge away or they may stay charged until the next time the telly is turned on.
3) any magnetic fields around transformers or windings in the TV will radiate their energy into the room as the fields collapse, or induce small currents in the circuits they are in that will soon decay.
4) The vast majority of residual energy will stored as heat, the telly will be hot. TVs with conventional glass Tubes are use a lot of power, especially large colour sets and they will be cooking when you turn them off, they will slowly cool down loosing this heat by convection to the room.
Modern TVs with LCD screens run much cooler because they handle much less energy. They build negligable charge on the screen and have smaller capacitors and transformers inside.
Of course if you switch your set to standby you will continue to use a little energy all the time it is not in use.
2006-11-21 21:39:44 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The charge in the TV when it is switched off is Negligible in quantity.
If the TV was ON for a long time then the charge present while it is switched off is converted into Heat that escapes from the unit through the ventilator Duct at the rear of the TV Unit
2006-11-21 22:29:43 · answer #2 · answered by Santhosh S 5 · 0⤊ 0⤋
It stays collected in capacitors and other related components thet are inside the tv desighned to store energy for short periods of time for the tv to work properly. After the main scource of energy (the AC inlet) is disconnected or swithed of, some of the energy will be still in those components. That energy will then be "used" by the internal resistance of all components and wiring in the tv. it is a standerd computable factor called copper losses. hope this answers your question.
2006-11-21 21:36:04 · answer #3 · answered by shmee 2 · 1⤊ 0⤋
When a TV is switched off, its capacitors will retain their charge for a long time if they are not connected to anything. This is why you shouldn't open up the back of a TV even if it's disconnected from the mains.
2006-11-21 21:25:19 · answer #4 · answered by iMacThere4iAm 3 · 1⤊ 0⤋
The elements holding charge begins discharging. The resultant small current passes thru TV circuitry resistence & the energy is converted 2 heat energy in those resistances(R). (E=I^2*R)
2006-11-21 21:26:26 · answer #5 · answered by Banglacat 2 · 0⤊ 1⤋
Telies at least the old picture tube type hold a huge charge in the picture tube, even with set unplugged for a long, long time.
2006-11-21 21:28:25 · answer #6 · answered by Charles-CeeJay_UK_ USA/CheekyLad 7 · 0⤊ 0⤋
when you touch the tv screen after you turn it off you'll feel static energy. thats where the power goes. energy cant just disappear, it can only be changed from one form to another
2006-11-21 21:21:40 · answer #7 · answered by think outside the box 2 · 0⤊ 1⤋
i always wandered this aswell - physics teacxhes us that energy can only be released as heat, light, sound, movement - so where does all that energy go when its on standby -surely not that little light? apparently they still use 70-% whilst on standby - but how?
2006-11-21 21:30:51 · answer #8 · answered by mark_gg_daniels 4 · 1⤊ 0⤋
IT WILL CHANGE TO HEAT IN ELECTRONIC ELEMENTS
2006-11-21 21:31:46 · answer #9 · answered by zarei_m 2 · 0⤊ 0⤋