Question

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

A. $1.64M\Omega \pm 5\% $
B. $530k\Omega \pm 5\% $
C. $64k\Omega \pm 10\% $
D. $5.3M\Omega \pm 5\% $

Answer 1

Hint: To solve this question you need to remember the resistor color table and the basic color combination of resistor that from 1st band to 3rd band only color from black to white can represent these bands but the 4th band represented by the color like gold, silver, and no color, these color shows the tolerance of the resistor.

Complete Step-by-Step solution:
Let first find the color combination of the carbon resistance

Now to find the resistance of the carbon resistance we have to find the values of the color code
By the resistor colour code table we know that in the given color combination G stands for green, O stands for Orange and Y represent yellow and

In the 4 bands type resistor 1 digit is represented by 1st colour in the resistor similarly 2nd color represents 2nd digit but in the 4 bands resistor 3rd color works as a multiplier and the last color represents the tolerance of the resistor.
Therefore $R = 53 \times {10^4} \pm 5\% $ = $530k\Omega \pm 5\% $
Hence, B is the correct option.

Note: In the above solution we used a term tolerance many times where the tolerance is the maximum difference between its actual value and the required value these errors generally expressed as + and – percentage value. Inherently, the resistors have no tolerance. They 're built up to those tolerances. This is the degree the resistance could have changed from the value specified. So if you have a 1 K\[\Omega \] resistor with 10% tolerance, the resistor's real value will be between 900\[\Omega \]and 1100\[\Omega \].