sentence2_structure: You<>call<>materials able to conduct electricity with 100% efficiency
sentence1: ENERGY MANAGEMENT AND EQUIPMENT American Superconductor AMSC Develops and manufactures products using super conducting materials and power electronic devices for electric power applications.
sentence2: You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.
question: What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?