I want to calculate the current passing in the wall socket using iphone.I am using CMMotionmanagerFramework and i got X,Y,Z values with that values i can calculate the magnetic field across the surroundings by using those values i want to calculate the voltage level of the wall socket. Please provide me the answer.
How to calculate the voltage value for current from the wall socket using iphone magnetometer values?
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The magnetic field strength gives you the electric field strength in volts per meter, related to the velocity of the electrons. The velocity of the electrons is known as the drift velocity, and is related to the current. The electric field strength depends on the charge density in the wire, which should be a constant you can find for the wire you're using, and the distance from the detector to the wire.
So your magnetic field strength depends on a bunch of constants related to the physical arrangement of your problem and the current in the wire. You can derive that using your iPhone's magnetometer, knowledge of its accuracy and some maths. The voltage drop (potential difference) across the outlet is related to the current by the reactance, because you're probably looking at an Alternating Current system so inductances and capacitances play a role, in addition to the resistance.
However you probably don't need to calculate the potential difference, because the electrical utility company will tell you what it is.