The color pattern of the primary bands on a resistor are black, brown, red, orange, yellow, green, blue, violet, grey, white - representing 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
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galvanized metal is a silvery gray colour which also has a pattern on it.
Green is 5ohms and gold is 5% tolerance. It depends if there are other bands though. See related link
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
On Circuit Resistance = Close to the total load Resistance. Off Circuit Resistance = Near Infinitive High Resistance.
Hot resistance is your total resistance you can have with out exceeding your wattage limit