Current Electricity 5 Question 6

6. A carbon resistance has a following color code. What is the value of the resistance?

(a) 5.3MΩ±5

(b) 64kΩ±10

(c) 6.4MΩ±5

(d) 530kΩ±5

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Solution:

  1. The value of a carbon resistor is given as

R=AB×C±D

where, colour band A and B (first two colour) indicates the first two significant figures of resistance in Ohms.

C (third colour) indicate the decimal multiplies and D (fourth colour) indicates the tolerance in as per the indicated value. The table for colour code,

Colour code Values
(AB)
Multiplier
(C)
Tolerance
Black 0 100
Brown 1 101
Red 2 102
Orange 3 103
Yellow 4 104
Green 5 105
Blue 6 106
Voilet 7 107
Grey 8 108
White 9 109
Gold - - ±5
Silver - - ±10
No colour - - ±20

Comparing the colours given in the question and table and writing in the manner of Eq. (i), we get

R=53×104±5 or R=530×103Ω±5



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