Very quick Potentiometer Question

[ollie]

Does ohm's law apply for pots in parallel with normal resistors?

i.e. If I connect a 1k resitor over 2 of the lugs of a 10k pot will the pot range be from 0ohms (theorectically of course) to  909ohms, ignoring tolerance, that ohm's law suggests?

I need to buy some pots to start working on some projects and have no pots. Looked for a bag of mixed pot values but can't find one anywhere, just mixed types (sliders, etc.) so thought that I could buy some 1M and 10K pots and use resistors to bring their values down.

Also, as an aside, what about normal resistors in series, does ohm's law apply - resistor ohmage + whatever the pot is set to ohmage?

Thanks in advance

ollie

[Ripthorn]

Ohms law works for any complex impedance (it's not just a good idea, it's the law ).

[petemoore]

  Get the DMM to take a look at it for ya.. 
  Million experiments you can try, they're great for getting immediate answers demonstrated at most times.
  Measure resistor resistance, then try two in parallel, two in series, notice the multiplicitave or dividing nature of the results...
  Using 2 x 100k resistors for experiments:
100k + 100k = 200k
Two parallel 100k = 50k
  Unequal resistors can build 'unusual' resistance values...as needed, use the DMM to verify the math actually builds 'x' value..

[MohiZ]

i.e. If I connect a 1k resitor over 2 of the lugs of a 10k pot will the pot range be from 0ohms (theorectically of course) to  909ohms, ignoring tolerance, that ohm's law suggests?

Yes, if you connect it for instance between lugs 1 and 2, and use the pot as a variable resistor. If you need all 3 pins used, then it's a little more complicated. Check out this easy calculator:
http://www.diystompboxes.com/analogalchemy/emh/emh.html

If you want to learn more, read this good article:
http://gaussmarkov.net/wordpress/parts/resistors/resistors-6-mods/

It should be close to what you're looking for from the first sentence!