Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: 
Combining the elements of voltage, current, and resistance, Ohm developed the formula:
Where
- V = Voltage in volts
- I = Current in amps
- R = Resistance in ohms
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