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        Q: Which potentiometer should i use?
A: USB is a digital connection , and a potentiometer is an analogue device , so they were able not to be linked directly . You can presumably find devices that will interface to the USB and have a rotary motion , such as digital encoders .   . 

Q: What is the difference between voltmeter and potentiometer?
A: A potentiometer is a variable resistor , while being a voltmeter is a device that the measurements voltage . 

Q: Trimmer potentiometer?
A: JUST FOR ONE TIME CIRCUIT ADJUSTMENT TO MEET THE CIRCUIT REQUIREMENT , LIKE TO ADJUST A REFERENCE VOLTAGE SOURCE , A CURRENT LIMIT PRESET , TRIGGER LEVEL ... ETC .