Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Baladya:
--- Quote from: deadman786 on May 26, 2010, 10:36:37 pm ---Guys just one thing. Do we need to know how bistable circuits work for tomorrow? And what about a bridge rectifier?? Especially the example in June 09(If it has been answered, just mention the page number) . All I get is that it ends in a short-circuit :D. Smoked paper 1 and p 6 was good too but I'm scared about this one :'(....
--- End quote ---
I didnt study the bistable circuits cuz simply its SO FREAKIN CONFUSING and evrytime i try to understand it, i cant :S
6394:
--- Quote from: Baladya on May 26, 2010, 10:38:08 pm ---I used to do ur mistake... forget about resistance...
use P=VI ... when there is a higher Voltage there HAS to be a lower current. THE POWER IS THE SAME, its not changed. so when one is increased, the other decreases.
The more the current, the more there is heat loss. so we want a high voltage, which will cuz the current to be less and so less heat lost. but the same power will be given.
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lol hlpd me as wel Thanks
:P;)
diva_sparkles:
--- Quote from: Baladya on May 26, 2010, 10:39:36 pm ---I didnt study the bistable circuits cuz simply its SO FREAKIN CONFUSING and evrytime i try to understand it, i cant :S
--- End quote ---
same here!!!!!!lol
blackberry:
--- Quote from: Baladya on May 26, 2010, 10:38:08 pm ---I used to do ur mistake... forget about resistance...
use P=VI ... when there is a higher Voltage there HAS to be a lower current. THE POWER IS THE SAME, its not changed. so when one is increased, the other decreases.
The more the current, the more there is heat loss. so we want a high voltage, which will cuz the current to be less and so less heat lost. but the same power will be given.
--- End quote ---
Nice!!!
Ivo:
Right a couple of questions from w08 (Link: http://www.freeexampapers.us/IGCSE/Physics/CIE/2008%20Nov/0625_w08_qp_03.pdf)
1) d) ii) - how to work out average speed?
2) d) - why include 200g mass as well?
5) c) - why 16.3-2.1, I don't get it.
8) d) i) - why series and not parallel?
9) a) ???
Sorry for the flooding of qu.
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