Three resistors of 2, 3 and 5 ohms are connected in series. The total resistance is
Correct answer: A. 10 ohms
- A. 10 ohms
- B. 0.97 ohms
- C. 1.03 ohms
- D. 30 ohms
Explanation
Series resistances simply add, giving 10 ohms, and the same current passes through each while the voltages divide in proportion to the resistances. In parallel the reciprocals add, which for these values gives about 0.97 ohms, always less than the smallest resistor. Recognising which arrangement the question describes is half the work.
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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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