For an electrical conductor, by Ohm`s law: If V = Voltage across its ends , R= resistance offered to current flow and I = Current flowing through it , then 1. V is directly proportional to I. 2. The ratio V/I is constant and equal to R.
If I = 2 Amperes and V = 20 volts then R = 20/2 = 10 ohms.
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