Which factor most directly affects energy delivery in a long low-voltage wire?

Which factor most directly affects energy delivery in a long low-voltage wire?

• A. Temperature of the ground
• B. Number of wires bundled
• C. Size of the conduit
• D. Length of the run

Answer: (D)

Longer runs increase the resistance of the wire, and that directly reduces energy delivery in a low‑voltage system. Resistance for a given conductor is proportional to length, so doubling the run length adds more resistance. With a fixed supply, that extra resistance causes a voltage drop (V = I × R) and power lost as heat (P = I^2 × R), leaving the load with less voltage and thus less energy. Temperature of the ground, how many conductors are bundled, or the conduit size can affect heat dissipation a bit or influence practical setup, but they don’t affect delivered energy as directly or as much as the length of the run.

Longer runs increase the resistance of the wire, and that directly reduces energy delivery in a low‑voltage system. Resistance for a given conductor is proportional to length, so doubling the run length adds more resistance. With a fixed supply, that extra resistance causes a voltage drop (V = I × R) and power lost as heat (P = I^2 × R), leaving the load with less voltage and thus less energy. Temperature of the ground, how many conductors are bundled, or the conduit size can affect heat dissipation a bit or influence practical setup, but they don’t affect delivered energy as directly or as much as the length of the run.