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.
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
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.
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
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.
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
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. R O Y of Great Britain has a
Very Good Wife
Some Resistors in the Industry
1/4W Metal R
|| Riedon MFR
|Audio Gold Ohmite
|LVC Ser LVC-1
|1/4W Metal Film
1R to 10M
|1 Ohm to 10 Meg
Tolerance to ± 0.05%
Low Temp. Coeff.
TC ± 3ppm/°C
Very Low Inductance
Matched Sets Available
precision resistor networks
|3 watt to 50
Reduces signal distortion
Minimizes thermal EMI
Terminal Barrier Resists Ag Migration
|3, 4, and 5 -
decade voltage dividers
10:1 - 10,000:1
1,200 volts continuous
overvoltage to 2KV
current sense applications
low profile, cost
Resistor Color Code Picture