Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Dana:
--- Quote from: NightHawkerr on May 26, 2010, 07:49:34 pm ---LDR :
As Light intensity decreases on LDR, The resistance across it increases, thus V input increases. When V input is more than 0.6 V, the transistor is switched ON, and thus the lamp/ alarm etc. turns ON.
--- End quote ---
Thaanks so much, but the transistor thing is confusing, when the base current increases does the collector current increase or decrease?? ??? do you mind explaining that part please?
Dana:
And you guys there are 2 wires going through a paper, both of them are now connected to a battery source. The current is going down both. Why and in what direction does the flexible wire move? its so confusingg ??? MJ 08 qs 9) c)
Pleaseee answerr! Thanks in advance
CatAly$t:
who can answer this question(part c)??8)
Dana:
--- Quote from: CatAly$t on May 27, 2010, 09:13:59 am ---who can answer this question??? 8)
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To calculate the current you need either power/ voltage and/or resistance. They might've given you that information previously. If you know the power and the voltage is given (12) then use the power formula. If they gave you the resistance then use the second formula
P=IV or V=IR
Ghost Of Highbury:
--- Quote from: Dana on May 27, 2010, 09:12:15 am ---And you guys there are 2 wires going through a paper, both of them are now connected to a battery source. The current is going down both. Why and in what direction does the flexible wire move? its so confusingg ??? MJ 08 qs 9) c)
Pleaseee answerr! Thanks in advance
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