The resistance of a carbon resistor of colour code Red-Red Green Silver is (in `k Omega`)

Options

A. `22 00 pm 5%`
B. `2200 pm 10%`
C. `220 pm 10%`
D. `220 pm 5%`

Answer

To find the resistance of a carbon resistor with the color code Red-Red-Green-Silver, we can follow these steps:

### Step 1: Identify the digits from the color code
- The first two colors (Red and Red) represent the first two significant digits of the resistance.
- According to the color code:
- Red corresponds to the digit **2**.
- Therefore, the first digit is **2** and the second digit is also **2**.

### Step 2: Determine the multiplier
- The third color (Green) indicates the multiplier.
- According to the color code:
- Green corresponds to a multiplier of **10^5**.

### Step 3: Calculate the resistance value
- Combine the significant digits and the multiplier:
- The resistance value can be calculated as:
\[ R = (22) \times (10^5) \, \Omega \]
- This gives us:
\[ R = 2200000 \, \Omega \]

### Step 4: Convert to kilo ohms
- To convert ohms to kilo ohms, we divide by 1000:
\[ R = \frac{2200000}{1000} = 2200 \, k\Omega \]

### Step 5: Determine the tolerance
- The last color (Silver) indicates the tolerance.
- According to the color code:
- Silver corresponds to a tolerance of **10%**.

### Final Result
- Therefore, the resistance of the carbon resistor is:
\[ R = 2200 \, k\Omega \, \pm \, 10\% \]