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To choose the value of the resistor you have to follow the ohm's law that is
V=IR
so that you can find the value of the resistor by knowing voltage and current value
Ofcourse use Ohms Law i.e. V=IR.
But that is not the only thing. You should also know the tolerance, wattage and package of the resistor.
If you are using the resistor across the measuring end, then the tolerance really play are greater role.
If you are using the resistor as current limiting, then the wattage matters, I2R.
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