Question

The colour code for a carbon resistor of resistance $0.2\,k\Omega \pm 10$% is

• A. Red, Grey, Brown, Silver
• B. Red, Green, Brown, Silver
• C. Red, Grey, Silver, Silver
• D. Red, Green, Silver

Answer 1

The Correct Option is A

For carbon resistors, the color codes represent the following:
The first digit is represented by the first color,
The second digit is represented by the second color,
The third color represents the multiplier (power of 10),
The fourth color is the tolerance. In this case, the resistance is 0.28 kΩ (280 ohms) with a tolerance of ±10%.
The first digit is 2, which corresponds to Red,
The second digit is 8, which corresponds to Grey,
The multiplier is 10, which corresponds to Brown,
The tolerance is ±10%, which corresponds to Silver.

Thus, the color code is Red, Grey, Brown, Silver.