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Its my exam on Monday!!

Its my exam on Monday!! - Physics Forum

Its my exam on Monday!! - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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Old 01-10-2004, 03:33 PM
tony
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Default Its my exam on Monday!!



>
A potentiometer is simply a resistor that has its resistive element exposed and
touched by a slider of some kind. If a voltage is imposed across the 'pot' the
slider can be adjusted to select some fraction of that voltage

Suppose the total resistance of the 'pot' is 1000 ohms, and the slider is
positioned so it's 300 ohms from the bottom. Since correct usage of a pot is
such that there's very little current taken from the slider the voltage the
slider sees is

V(slider) = V(total) * 300 / 1000. It's fairly simple to calculate voltage even
if there is a curent load taken from the slider if you know how to calulate
voltages in resistive networks.





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Old 01-10-2004, 06:10 PM
Danny
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Default Its my exam on Monday!!

Hi

I think i might be taking the same exam on monday, and i think i might
have the answer to that question, if you can specify which exam and past
paper that question was from, i can help.

tony wrote:

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