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ALL PHYSICS DOUBTS - POST HERE !!
Ghost Of Highbury:
--- Quote from: Ari Ben Canaan on May 24, 2010, 04:00:32 pm ---R1 should be LESS than R2 for the Voltage output to BE HIGH.
Hence, the thermistor should have a lower resistance (example when heated) than the VARIABLE resistor in order for the V output to the transistor to EXCEED 0.6 V and hence trigger the transistor.
--- End quote ---
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.
Mr.DitD:
--- Quote from: Ari Ben Canaan on May 24, 2010, 04:00:32 pm ---R1 should be LESS than R2 for the Voltage output to BE HIGH.
Hence, the thermistor should have a lower resistance (example when heated) than the VARIABLE resistor in order for the V output to the transistor to EXCEED 0.6 V and hence trigger the transistor.
--- End quote ---
I think u're right. But what is exactly "voltage output"!?!?
I have a very big issue with voltage!!! ???
By the way can someone please explain the general functioning of the transistors!?!?!
Ghost Of Highbury:
--- Quote from: Mr.DitD on May 24, 2010, 04:06:07 pm ---I think u're right. But what is exactly "voltage output"!?!?
I have a very big issue with voltage!!! ???
By the way can someone please explain the general functioning of the transistors!?!?!
--- End quote ---
The voltage in the emitter part of the transistor?
holtadit:
--- Quote from: Mr.DitD on May 24, 2010, 04:06:07 pm ---I think u're right. But what is exactly "voltage output"!?!?
I have a very big issue with voltage!!! ???
By the way can someone please explain the general functioning of the transistors!?!?!
--- End quote ---
Dude, such questions are for three marks.
The MS gives three points - just memorise them; few days left to the exam and you have no other choice.
Malak:
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 :)
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