Why don't you put a simple circuit together? Get a 9 volt battery, a 1Kohm resistor, and a multimeter. First measure the exact voltage of the battery, and the exact resistance of the resistor. Then connect the resistor to the battery, in series with the multimeter (set in current mode). What current does it show? Then put the resistance and voltage into Ohm's Law (E=IR, or rearranged to get current, I=E/R). What current do you get? Is it close to what your multimeter showed?The wiki page that Bertus gave was somewhat helpful.But my question is different that whether e=ir has a mathematical proof or its just a experimental approximate consequence?
That and Voltage is defined as Current*ResistanceMaybe the correct thinking is to say that Power is defined as Voltage*Current and then work your way through Ohm's law.
Here is the 'proof' on how to derive Ohms law:I have seen it but thats not the proof.
Ah, this guy. I've seen him before on more than one occasion
His name is Walter Louin: he used to be a nuclear physicist. I think he left MIT for X-ray Astronomy.Ah, this guy. I've seen him before on more than one occasion
I must say, he's good at what he does, and he sure knows his stuff!
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