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.

Answer 2

The color code for resistors follows a specific pattern based on the number of digits and the tolerance. The first two bands represent the first two digits of the resistance value, the third band represents the multiplier, and the fourth band represents the tolerance.

For a resistance value of \( 0.28 \, \text{k}\Omega \) or \( 280 \, \Omega \), the color code is determined as follows:

1. First Band (Red): The first digit is 2, which corresponds to the color red.
2. Second Band (Grey): The second digit is 8, which corresponds to the color grey.
3. Third Band (Brown): The multiplier is \( 10^1 \) (since the value is in \( \Omega \)), which corresponds to the color brown.
4. Fourth Band (Silver): The tolerance is \( \pm 10\% \), which corresponds to the color silver.

Thus, the correct color code for a \( 0.28 \, \text{k}\Omega \) resistor with a tolerance of \( \pm 10\% \) is:\(\text{Red, Grey, Brown, Silver}\)

Therefore, the correct answer is (A) Red, Grey, Brown, Silver.