(quoted from post at 10:14:07 02/06/13) You are correct sir.
Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Grey, White.
Representing the numbers 1 thru 9
Tolerances are 5% gold, 10% silver, no tolerance band, 20%
First two are value, 4th is multiplier, 5th if there is one is tolerance.
Reading is from the end of the resistor that the rings are closest to.
So the 100K mentioned would be Brown, Black, Yellow (4 zero'),
for 1, 0, 0000.
Size varies as wattage rating and that is usually double the maximum dissipation expected in the circuit.
On resistors higher than 2watt, the value and wattage are stamped on it, not banded.
First part of my tech training in the service.
In helping to size a resistor to run a fence charger monitor, that poses a unique problem. If using an LED diode, it operates off about 1.5 volts. The fence charger will put out 5,000 volts more or less depending on model.
However, as we all know that voltage has an on-off duty which is quite small (making for low wattage even though the voltage is high) and there is an inline resistance in the charger too so that you get the "snap" of the voltage to cause the desired effect, but the current that is delivered in that snap is limited so that it doesn't pose a health (deadly short) problem for the recipient. I guarantee you it's not like getting across your local utility power line.
So personally, I can't help with the desired size.
High voltage can energize neon lights. Used to know a guy that repaired radio receiver/transmitters, and had a 40w neon bulb hanging adjacent to his test station. When he'd key a transmitter, the bulb would illuminate.
On the fence charger, I don't know if the duration of the snap is long enough in duration to ionize the neon gas.
Mark
