Discussion
Which voltage drop is acceptable on the starter supply cable?
Answer: C
Manufacturers typically allow around half a volt on the insulated side and less on the earth. Zero is impossible with any real conductor. A whole volt at two hundred amps means two hundred watts being wasted as heat. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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