BS 1852
Encyclopedia
The British standard BS 1852 and its replacement, BS EN 60062, comprises a colour code for fixed resistor
Resistor
A linear resistor is a linear, passive two-terminal electrical component that implements electrical resistance as a circuit element.The current through a resistor is in direct proportion to the voltage across the resistor's terminals. Thus, the ratio of the voltage applied across a resistor's...

s; letter and digit code for resistance (R for ohms, K for kilohms and M for megohms) and capacitance values.

Codes

Letter code for resistance and capacitance tolerances and a date code for capacitors and resistors:


coding:
BB - 1/8 WATTS,
CB - 1/4 ″ ,
EB - 1/2 ″ ,
GB - 1/1 ″ ,


5 - ±5% tolerance,
2 - ±20% ″,
1 - ±10% ″,

Steps to find out the resistance or capacitance values:

  1. 1st 2 letters gives the power dissipation capacity.
  2. next 3 digits gives the resistance value.
    1. 1st 2 digits are the significant values
    2. 3rd digit is the multiplier.
  3. final digit gives the tolerance.

Examples

If a resistor is coded :
  • EB1041: power dissipation capacity = 1/2 watts, resistance value = 10×10^4±10% = 9×10^4 ohms, 11×10^4 ohms.
  • CB3932: power dissipation capacity =1/4 watts, resistance value = 39×10^3±20% = 46.8×10^3 ohms, 31.2×10^3 ohms.


Examples of resistance values
R47 0.47 ohm
4R7 4.7 ohm
470R 470 ohm
4K7 4.7 kilohm
47K 47 kilohm
47K3 47.3 kilohm
470K 470 kilohm
4M7 4.7 megohm
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