Reference

Resistor Color Code

0:Black (x1 Ohm)
1:Brown (x10 Ohm)
2:Red (x100 Ohm)
3:Orange (x1,000 Ohm)
4:Yellow (x10,000 Ohm)
5:Green (x100,000 Ohm)
6:Blue (x(1,000,000 Ohm)
7:Violet (x0.1 Ohm)
8:Grey (+/- 5%)
9:White (+/- 10%)

Wavelength

wavelength = c/f

where c=1127 ft/s at 70 degrees F and f = frequency in Hertz

Power

P = E^2/R

where P = watts, E = voltage and R = resistance in Ohms