Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
WARRIOR:
--- Quote from: A@di on May 24, 2010, 04:05:43 pm ---Yes, thats exactly wat i said. Whats the confusion about?
applying V-I*R, when R decreases (thermistor), the Voltage decreases. So, the other part, Vbe , the variable resistor part gets more voltage, and if V>0.6V is flowing throught the emitter of the transistor, the transistor switches on.
--- End quote ---
i got it !! jut one last thing i want to clear.
if teh voltage accroos the variable resistor is HIGHT does that mean voltage across Vbe will be high?
Ghost Of Highbury:
--- Quote from: Kimo Jesus on May 24, 2010, 04:08:53 pm ---i got it !! jut one last thing i want to clear.
if teh voltage accroos the variable resistor is HIGHT does that mean voltage across Vbe will be high?
--- End quote ---
yes, actually, the voltage across Vb/e is high, as the variable resistor is a part of that side, v also say the voltage across Variable resistor is high.
WARRIOR:
--- Quote from: ang3l on May 24, 2010, 04:08:15 pm ---http://www.freeexampapers.us/IGCSE/Physics/CIE/2006%20Nov/0625_w06_qp_1.pdf
Q15 Why is it D?
Q18 ans and Explaination
Q31 ans and Explaination
Thx :)
--- End quote ---
THE HEAT GIVEN AT MELTING POINTS AND BOIILING POINTS IS CALLED LATENT HEAT / ENERGY
the heat is used to BREAK BONDS between molecules in order t chnage state .It is not used to give kinteic energy to molecules therfore doesnt heat the molecules up and no temp rise
18- C??? best for convectional currents if u dotn kno ask
IS D THE ASNWER OF 31
WARRIOR:
--- Quote from: A@di on May 24, 2010, 04:11:31 pm ---yes, actually, the voltage across Vb/e is high, as the variable resistor is a part of that side, v also say the voltage across Variable resistor is high.
--- End quote ---
oki doki ..thanks man AGAIN
i thought i got this before but hmm :/
should be fine now ;)
Ghost Of Highbury:
--- Quote from: Kimo Jesus on May 24, 2010, 04:19:11 pm ---oki doki ..thanks man AGAIN
i thought i got this before but hmm :/
should be fine now ;)
--- End quote ---
no problem
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