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Basics Resistance 

Resistance opposes the free flow of electrons. It is measured in Ohms. The symbol is Ω.
Resistance is the number of volts needed to make one amp flow through the resistor. R = V / I
If you know the current (I) through a resistor and the voltage (V) across a resistor, you can calculate the resistance ...
R = V / I
I = V / R
V = I R
With any two known values, the third can be calculated.
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