ALL PHYSICS DOUBTS - POST HERE !!

[Syed Kazim]

like increasing the length of the wire increases resistance so what does increasin thickness of wire do?

An increase in the length of a wire will decrease increase the resistance.
An increase in the diameter of a wire will decrease the resistance.

[Malak]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss

For c use this formula p=I^2 * r

d) The simple voltage formula that is V= IR
You jst hav to calculate the voltage drop by the resistor

e) There r 2 resistor so for one resistor the voltage drop is 7.5...Multiply by it 2 and subtract from the 22000

[Baladya]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss

cmon plzzz help   

[Baladya]

For c use this formula p=I^2 * r

ya okay, but thats for power, but they said energy??

[blackberry]

thanks syed, baladya and diva!!!!!!!!

i kan sleep in peace noww!!!

[Vin]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss

u got afternoon right ?? thn i;ll do this tmw (for me). . im off to sleep
like ang3l said use

H= I^2R

H is loss of heat energy

[diva_sparkles]

cmon plzzz help   

rate of loss of energy is the definition of power so thts how u do it!!!

[Helium]

hey can anyone explain me question 9(C) (2) ? 0625/31/M/J/08

You can use fleming left hand rule to find the movement of the flexible wire.

-Point first finger in  the direction of the magnetic field (from n to s)
-rotate your hand about that your finger until your second finger points in the direction of the Current.

then your thumb points in the direction of the movement of wire

[Malak]

ya okay, but thats for power, but they said energy??

Energy loss = I^2 R
thats how it is in my text book

[Baladya]

u got afternoon right ?? thn i;ll do this tmw (for me). . im off to sleep
like ang3l said use

H= I^2R

H is loss of heat energy

k thx all Vin plz stay alive for tommorow xD jk but plz help tommorow

[Syed Kazim]

ya okay, but thats for power, but they said energy??

Yes, same thing.

[diva_sparkles]

An increase in the length of a wire will decrease the resistance.
An increase in the diameter of a wire will also decrease the resistance.

sory 2 say but an increase in length increases resistance

[Syed Kazim]

thanks syed, baladya and diva!!!!!!!!

i kan sleep in peace noww!!!

You're welcome.

[NightHawkerr]

Can somebody tell me what to study for the CRO for tomorrow's exam? I mean I know how to label and stuff, but then they get too complicated! HELP!

[Malak]

sory 2 say but an increase in length increases resistance

correct