|Sep17-05, 10:49 AM||#1|
in measuring unknown emf by potentiometer, why must the stable current source(working battery) have a voltage greater than any voltage to be measured?
i cant understand why..
in our exercise in physics, we used a slide-wire potentiometer with the assumption that 1 meter of the slide-wire gives a voltage drop of 1V. so, the battery we used has an emf slightly greater than 2 volts.
is there a connection between the length of the slide wire used and the use of a battery with an emf greater than 2V?
i am currently doing our physics lab report and honestly, its part of the discussion. im asking for help for i cant understand.
tanx to anybody who dares to reply..
|Sep17-05, 02:12 PM||#2|
If the voltage across that entire length is not greater than the voltage you are trying to measure, there will be no point where it is equal to the measured voltage.
|Sep17-05, 02:19 PM||#3|
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