ALL PHYSICS DOUBTS - POST HERE !!

[Vin]

something like this .. pls. excuse the handwriting  

[Baladya]

omg i have a *censored* (yes i said it  cuz its really paining) headache :S I m gonna go sleep now bb all  

[pglasg74]

can someone help and attach a drawing of 8a please

http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Jun/0625_s07_qp_3.pdf

[blackberry]

baladya u told me dat power loss kan be reduced by reducing resistance??

me textbuk says dat high voltage reduces power loss which means that resistance is also high so current is low!!!
so....which one is it??? i am sooo confused!!!

[pglasg74]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Jun/0625_s07_qp_3.pdf


someone please tell me why number 9 its anticlockwise.. if i used FLH, my index points right,

[6394]

something like this .. pls. excuse the handwriting  

u still on lol
 

[red_911]

something like this .. pls. excuse the handwriting  

lool @ the handwriting   

[the_grim_reaper]

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 . Smoked paper 1 and p 6 was good too but I'm scared about this one ....

[pglasg74]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Jun/0625_s07_qp_3.pdf


someone please tell me why number 9 its anticlockwise.. if i used FLH, my index points right, and my middle finger points towards me cse of the current (right?) so my thumb is up.. which means its clockwise.. what am i doing wrong?

[Baladya]

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.

[Baladya]

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 . Smoked paper 1 and p 6 was good too but I'm scared about this one ....

I didnt study the bistable circuits cuz simply its SO FREAKIN CONFUSING and evrytime i try to understand it, i cant :S

[6394]

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.

lol hlpd me as wel Thanks
;)

[diva_sparkles]

I didnt study the bistable circuits cuz simply its SO FREAKIN CONFUSING and evrytime i try to understand it, i cant :S

same here!!!!!!lol

[blackberry]

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.

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.

d) i) - why series and not parallel?

9) a)

Sorry for the flooding of qu.