Which one is the best material for making connecting wires ?
Correct answer: D. copper
- A. iron
- B. tungsten
- C. silver
- D. copper
Explanation
Copper is preferred for connecting wires because it has low resistivity, so it carries current with little energy loss, and it is much cheaper than silver. Option c, silver, has even lower resistivity, but its high cost makes copper more practical.
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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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