Which statement is true about resistance values per meter?

Which statement is true about resistance values per meter?

• A. Mid cable resistance per meter is higher than heavy cable
• B. Heavy cable resistance per meter is higher than mid cable
• C. They have the same resistance per meter
• D. Resistance per meter is not provided for either cable

Answer: (A)

Resistance per meter depends on how thick the conductor is and what material it’s made from. For copper, which NMEA 2000 cables use, a larger cross-sectional area means less resistance per meter. Heavy cable has a bigger cross-section than mid cable, so its resistance per meter is lower. That makes mid cable—being thinner—have a higher resistance per meter. This matters because higher resistance per length leads to more voltage drop and power loss along the run, so engineers opt for heavier cable where lower resistance per meter is beneficial. The other statements don’t fit because heavier cable does not have higher resistance per meter, and the per-meter value is indeed specified for each cable type.

Resistance per meter depends on how thick the conductor is and what material it’s made from. For copper, which NMEA 2000 cables use, a larger cross-sectional area means less resistance per meter. Heavy cable has a bigger cross-section than mid cable, so its resistance per meter is lower. That makes mid cable—being thinner—have a higher resistance per meter. This matters because higher resistance per length leads to more voltage drop and power loss along the run, so engineers opt for heavier cable where lower resistance per meter is beneficial. The other statements don’t fit because heavier cable does not have higher resistance per meter, and the per-meter value is indeed specified for each cable type.