If the color code is violet, violet, blue, blue and violet, what is the resistance and the tolerance?
The correct answer and explanation is:
The color code violet, violet, blue, blue, and violet represents a 5-band resistor, and here’s how to calculate the resistance and tolerance:
Resistor Color Code Key:
- First Band (violet): 7
- Second Band (violet): 7
- Third Band (blue): Multiplier of 10^6 (1,000,000)
- Fourth Band (blue): Tolerance of ±0.25%
- Fifth Band (violet): Tolerance of ±0.1%
Steps to Calculate Resistance:
- First two bands (violet, violet): These bands represent significant digits. Violet corresponds to 7, so the first two digits are 77.
- Third Band (blue): This band is the multiplier. Blue corresponds to a multiplier of 10^6 (or 1,000,000).
- Calculating the resistance: The resistance is found by combining the first two digits with the multiplier. In this case, 77 × 1,000,000 = 77,000,000 ohms or 77 MΩ.
Tolerance Calculation:
- Fourth Band (blue): The fourth band represents tolerance, which is ±0.25%. This means that the actual resistance could vary by ±0.25% from the nominal value of 77 MΩ.
- Fifth Band (violet): The fifth band indicates the additional tolerance of ±0.1%.
Final Resistance and Tolerance:
- Resistance: 77 MΩ (77,000,000 ohms)
- Tolerance: ±0.1% (the lowest tolerance value).
Explanation:
Resistor color codes are used to represent the value of a resistor and its tolerance. The first three bands represent the resistance value, while the remaining two bands indicate the tolerance, which reflects how much the resistor’s actual value can vary from its stated value. The first two color bands give the significant digits of the resistor value, and the third band is the multiplier. The tolerance is crucial for precision applications, as it determines how much deviation from the nominal value is acceptable. In this case, with a tolerance of ±0.1%, this resistor will provide an extremely accurate resistance value.