Which statement best describes voltage drop in a long low-voltage line?

Which statement best describes voltage drop in a long low-voltage line?

• A. Temperature of the ground
• B. More wires bundled together
• C. Larger conduit
• D. The longer the run, the more drop occurs

Answer: (D)

Voltage drop is the amount of voltage that is lost as current travels through a conductor due to its resistance. The resistance of a wire adds up along the length, so the longer the run, the more resistance the current meets. Since voltage drop equals current times total resistance (V = I × R), a longer path means a larger V_drop. That’s why the statement “the longer the run, the more drop occurs” best describes voltage drop in a long low-voltage line. The other ideas don’t describe the primary relationship. Temperature of the ground can subtly affect resistance, but it isn’t the main factor here. Bundling more wires can change impedance somewhat, but it doesn’t capture the straightforward effect of length on drop. A larger conduit doesn’t change the wire’s resistance by itself, even though it may influence practicality or heat dissipation.

Voltage drop is the amount of voltage that is lost as current travels through a conductor due to its resistance. The resistance of a wire adds up along the length, so the longer the run, the more resistance the current meets. Since voltage drop equals current times total resistance (V = I × R), a longer path means a larger V_drop. That’s why the statement “the longer the run, the more drop occurs” best describes voltage drop in a long low-voltage line.

The other ideas don’t describe the primary relationship. Temperature of the ground can subtly affect resistance, but it isn’t the main factor here. Bundling more wires can change impedance somewhat, but it doesn’t capture the straightforward effect of length on drop. A larger conduit doesn’t change the wire’s resistance by itself, even though it may influence practicality or heat dissipation.