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IGCSE PHYSICS

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cooldude:

--- Quote from: nid404 on November 07, 2009, 05:48:12 pm ---oh yes and cooldude...that explanation ws really good :)

--- End quote ---

Thanks

@d!_†oX!©:
awesome explanation dude....

cooldude:

--- Quote from: @d!_†oX!© on November 07, 2009, 05:53:30 pm ---awesome explanation dude....

--- End quote ---

Thanks

moon:
Thanx 4 ur awesome explanation, but i still need J08 Q4 c 2nd varient and 4 that question y did u choose R1 and not R2??? ???

cooldude:

--- Quote from: moon on November 07, 2009, 06:08:20 pm ---Thanx 4 ur awesome explanation, but i still need J08 Q4 c 2nd varient and 4 that question y did u choose R1 and not R2??? ???

--- End quote ---

okay for y i chose r1 and not r2----

this is cuz r1 is just in place to prevent too much current flowing throught the transistor and damaging it. r1 and the thermistor r acting as a potential divider; when we change the resitance of one of the 2 the voltage across the thermistor or r1 changes depending upon which components resistance we have changed. as u knw the voltage flowing across a component is governed by the resistance of the component. since we have to change the value at which the temperature at which the bulb lamps we have to change the resistance of r1. r1 is a part of the potential divider, r2 is not


ill just answer ur other q with my next post

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