The colors of the strips on a certain carbon resistor from left to right are green, black, and blue, respectively. Its resistance is
Correct answer: D. 5.0 x 10^7 Ω
- A. 5.0 x 10^2 Ω
- B. 5.0 x 10^3 Ω
- C. 5.0 x 10^5 Ω
- D. 5.0 x 10^7 Ω
Explanation
The value of the first color in a color-coded resistor represents the first digit, the second color represents the second digit, and the third color represents the number of zeros. The correct resistance of the resistor with colors green, black, and blue from left to right is 5.0 × 107 Ω. The color code for resistors dictates the value of each color band, where green represents 5, black represents 0, and blue represents 6. Therefore, the resistance is calculated as 50 x 106 Ω, which simplifies to 5.0 × 107 Ω. The other options do not match the given colors in the correct order and thus do not represent the resistance of the resistor.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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