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What is the difference between a single-core power cord and a multi-core power cord?
unistrand

Advantages: low resistance, good conductivity and low price. Disadvantages: perishable, poor heat dissipation and difficult installation.

rope

Advantages: high resistance, slightly worse conductivity than single strand, and slightly more expensive. Disadvantages: soft and not easy to break, good heat dissipation and convenient installation. I'm in favor of using multiple strands.