P28_066 - A . Therefore, B is analogous to a coarse...

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66. (a) They are in parallel and the portions of A and B between the load and their respective sliding contacts have the same potential diFerence. It is clearly important not to “short” the system (particularly if the load turns out to have very little resistance) by having the sliding contacts too close to the load-ends of A and B to start with. Thus, we suggest putting the contacts roughly in the middle of each. Since R 1 >R 2 , larger currents generally go through B (depending on the position of the sliding contact) than through
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Unformatted text preview: A . Therefore, B is analogous to a coarse control, as A is to a ne control. Hence, we recommend adjusting the current roughly with B , and then making ne adjustments with A . (b) Relatively large percentage changes in A cause only small percentage charges in the resistance of the parallel combination, thus permitting ne adjustment; any change in A causes half as much change in this combination....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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