The third band in colour coded resistance represents

Options

A. Third digit of resistance
B. Number of zeros after two digits
C. Number of zeros after one digit
D. Percentage of tolerence of resistance

Answer

To solve the question regarding what the third band in color-coded resistance represents, we will follow these steps:

### Step-by-Step Solution:

1. **Understand Color Code Representation**:
- Resistors have color bands that indicate their resistance value. The first two bands represent significant digits, the third band represents the multiplier, and the fourth band represents tolerance.

2. **Identify the Role of the Third Band**:
- The third band in the color code is specifically used to indicate the multiplier. This means it tells us how many zeros to add to the significant digits represented by the first two bands.

3. **Express Resistance Value**:
- The resistance can be expressed as:
\[ R = (AB) \times 10^C \pm T \]
Where:
- \(AB\) are the significant digits from the first two bands.
- \(C\) is the value represented by the third band (which indicates the power of ten).
- \(T\) is the tolerance indicated by the fourth band.

4. **Example for Clarity**:
- If the first two bands are brown (1) and red (2), the resistance value starts as 12. If the third band is orange (which represents \(10^3\)), the resistance value becomes:
\[ 12 \times 10^3 = 12000 \, \Omega \]
- This shows that the third band indicates how many zeros to add after the significant digits.

5. **Conclusion**:
- Therefore, the third band in a color-coded resistor represents the multiplier, specifically the number of zeros to be added after the first two significant digits.

### Final Answer:
The third band in color-coded resistance represents the **multiplier** (number of zeros after the significant digits).