Transformer coils are made of aluminum and copper.

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Multiple Choice

Transformer coils are made of aluminum and copper.

Windings in transformers can be made from different conductive metals depending on design goals. Copper provides the best electrical conductivity and strong mechanical properties, so many transformers use copper windings. Aluminum is lighter and cheaper, so it’s often used in larger distribution transformers to save weight and cost. Because aluminum conducts electricity more poorly than copper, an aluminum winding typically needs a larger cross-section to carry the same current, and special care is taken with connections to prevent oxidation and deterioration. There are also designs using copper-clad aluminum, which combines a layer of copper on aluminum to balance conductivity and weight. So, transformer coils can indeed be made from aluminum or copper (and copper-clad aluminum), which makes the statement true.

Windings in transformers can be made from different conductive metals depending on design goals. Copper provides the best electrical conductivity and strong mechanical properties, so many transformers use copper windings. Aluminum is lighter and cheaper, so it’s often used in larger distribution transformers to save weight and cost. Because aluminum conducts electricity more poorly than copper, an aluminum winding typically needs a larger cross-section to carry the same current, and special care is taken with connections to prevent oxidation and deterioration.

There are also designs using copper-clad aluminum, which combines a layer of copper on aluminum to balance conductivity and weight. So, transformer coils can indeed be made from aluminum or copper (and copper-clad aluminum), which makes the statement true.

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