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电缆是具有金属导电结构、覆盖有绝缘材料的电线的总称，它可以传输产生的电能，特别是电子产品和城际配电，具体取决于电流。这些导体可能由单股铜线（有时是铝线）或编织在一起的细线线组成。为了承载相同的电流，铝线制成的电缆必须至少比铜线电缆粗一半直径。
由于铜线可以以更薄的结构承载更高的电流，因此它们被广泛用于空间受限的狭窄区域。另一方面，由铝线制成的电缆由于是一种较轻的金属，因此主要用于架空线路。这种电缆可以用钢丝编织物包裹，使它们更坚固。
