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The current out the wiper is essentially zero.
The current through the pot is 5V/100,000Ohms = 0.00005 amps = 50 microAmps = 0.05 milliAmps
The voltage Vg is zero because that is what the "g" is supposed to stand for "ground."
The wiper lead is going to a high impedance input to an ADC (Analog to Digital Converter). This is what turns the 0-5V to the 0-255 number that you use in your Pbasic code.
Hope this helps.
Joe J.
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