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Types of Resistors - Color code

The simplest electronic component next to the insulated copper-wire is this Resistor. You know that wire itself is a resistor and longer the wire the higher the resistance. It starts in Micro-Ohms for thick short wires and goes to Milli-Ohms and even Ohms in very very long and thin wires. That is the reason copper is chosen.
Getting Started in Electronics - Forrest M Mims III

Resistors start from Wires to Wirewound Types. Carbon Film Resistors are most Common, Metal Film Resistors are more stable and accurate. We have now SMD types with lower power some are Laser Trimmed Types for accurate values. Resistors Arrays are used in Digital Circuits. Some tutors of mine are made into EE Web Widgets.  Analog Tutors and Digital Tutors

Gold has low contact resistance, an excellent conductor and corrosion resistant.Hence they use it in Connectors. Nickle has good wear and abrasion resistance, it finds application in switches. Nichrome an alloy has a high resistance and used in heaters.Carbon too is used in electrodes and bushes. When carbon or metal is coated as a thin film on a ceramic base/substrate, we have the Metal and Carbon Film Resistors.The thin film is cut and ground to get the resistor value close to what was needed. You can scrape the paint off a 1/2 Watt Resistor and experiment with a blade.

Ultra High Resistance -Super Mox - Ohmite

Wirewound resistors could be Copper or Manganin for shunts or low values and Ni-Cr for Higher Values. You cannot wind a 1 Mega-Ohm by the wire-wound method, it would be expensive and have high-inductance and you will need a very thin wire. MEMS may make such things possible without winding wires but Watts or Power Capability and Dielectric Withstand capacity or Voltage Rating will be very low.     

Resistors at delabs

See an Example of Color Code Reading

1st band - 1st digit - Yellow = 4
2nd band - 2nd digit - Violet = 7

3rd band - Red = 2 (zeros)
Means Two Zeros Follow - 4700 ohms - 4.7 kilo ohms or 4k7 like in Philips Circuits.

Resistor Color Code

For 4 banded ones, MFR 1% first 3 bands represent first three digits, and fourth band stands for the number of zeros that follow. 4.7k will be Yw VtBk Bn.

Right End Band is for tolerance

Brown Band 1% -- MFR Metal Film Resistor is used in Instrumentation Electronics.
Gold Band 5% -- CFR Carbon Film Resistor is common for Consumer Electronics.
Silver Stripe is 10%

B. B. R O Y of Great Britain has a Very Good Wife
Bk Bn Rd Og Yw Gn Bu Vt Gy Wt
0 1 2 3 4 5 6 7 8 9

Black Brown Red Orange Yellow Green Blue Violet Grey White

Some Resistors in the Industry

Metal Film
Riedon MFR
Caddock Resistor Networks
                              Audio Gold Ohmite chip
1/4W Metal R Riedon MFR Resistor Networks
Audio Gold Ohmite
1/4W Metal Film Resistors.
High stability
Solid construction
1% tolerance
1R to 10M
1 Ohm to 10 Meg Ohm
Tolerance to 0.05%
Low Temp. Coeff.
TC 3ppm/C
Very Low Inductance
Matched Sets Available
39 standard models
Type 1776
precision resistor networks
Absolute Tolerance
Absolute T-Coeff
3 watt to 50 watts
Non-inductive available
Reduces signal distortion
Minimizes thermal EMI
Standard Sizes
Terminal Barrier Resists Ag Migration
-55C- +125C
Auto Insertion
1% MFR
tight tolerances
Highly stable
low noise
low temp-coeff
demanding applications
minimum tolerances
long-term stability
3, 4, and 5 - decade voltage dividers
10:1 - 10,000:1
1,200 volts continuous
overvoltage to 2KV
wire wound
ceramic core
high-end loudspeaker
amplifier applications
low value
chip resistors
current sense applications
low profile, cost

Resistor Color Code Picture

Resistor Color Code