Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
the_grim_reaper:
--- Quote from: ~VIN1094~ on May 25, 2010, 06:30:25 pm ---oh sorry i didnt see urs ..potential difference required for producing cathode rays is really high to produce high energy electrons .. also d.c. is required .. think about it .. u want to produce electrons from the cathode .. if its ac than cathode and anode would constantly be changing ;)
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hahahaah everyone from our class has a problem with AC and DC. Even I've asked that from VIN. Do you know why we've got a problem with AC and DC??? Cause we never really understood them. Our teacher says AC flows in two directions, DC in 1. (It's correct but not enough).End of story. Nothing else. So VIN, you may find it stupid, but I REALLY need you to please explain the what being AC or DC really means!!! :D
8T:
Could some1 explain q 13 o/n 03 ?
I keep getting mixed up with manometers !!
Ivo:
--- Quote from: deadman786 on May 25, 2010, 06:34:27 pm ---hahahaah everyone from our class has a problem with AC and DC. Even I've asked that from VIN. Do you know why we've got a problem with AC and DC??? Cause we never really understood them. Our teacher says AC flows in two directions, DC in 1. (It's correct but not enough).End of story. Nothing else. So VIN, you may find it stupid, but I REALLY need you to please explain the what being AC or DC really means!!! :D
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I think this is it:
AC: alternating current (switches from positive to negative terminal and back to postivie)
DC: direct current (only flows from postivve to negative)
Also, please can someone answer my last post, thanks!
Ghost Of Highbury:
AC - The direction of current periodically reverses , positive to negative, negative to positive, positive to negative...and so on
DC - is the unidirectional flow of electric charge
Ghost Of Highbury:
--- Quote from: Ivo on May 25, 2010, 06:29:52 pm ---Please can you see if the following is accurate, please also confirm that heat loss is due to increase of current.
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Yea heat loss is due to current. H = I^2r...(I^2)!!!
yes, its A, thicker.
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