I think there are many variables in this, the size of the potato, the potato it's self, how much of what metal you are using to produce the electrical exchange.
for an experiment I took a large potato just now, I sanded down one side of two pennies so that half was copper and half was zinc, I stuck these pennies deeply into the large potato then tested with a multimeter.
It produced 0.55v at 0.00mA
I'm sure if I had proper copper/zinc rods I might be able to produce better results, but it doesn't seem to be very promising in the mA area.
There are 0.075 amps in 75 milliamps.
potato
There are zero milliamps in 12 watts.
7500 milliamps is equivalent to 7.5 amps. To convert milliamps to amps, you divide by 1000.
1 amp = 1000 milliamps so 1700 milliamps = 1.7 amps.
There are 1,000 milliamps [mA] per amp.
3000 milliamps is equal to 3 amps. To convert milliamps to amps, you divide by 1000.
1,000 milliamps = 1 amp 180 milliamps = 0.18 amp
830 milliamps is equal to 0.83 amps.
25 milliamps (mA) is equal to 0.025 amps (A). This conversion is done by dividing the milliamps by 1,000, as there are 1,000 milliamps in one amp. Therefore, 25 mA can be expressed as 0.025 A.
1,000 milliamps = 1 amp 200 milliamps = 0.2 amp
.17A=170mA