60. Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое сопротивление проводника? Что такое сверхпроводники?

What is the resistance of a conductor? What is a superconductor?

Electric resistance is a physical size, characterizing properties of explorer to prevent to passing of electric current and equal to the relation of tension on the ends of explorer to strength of current aleak on him. Resistance for the chains of alternating current and for the variables of the electromagnetic fields is described by the concepts of impedance and impendance. By resistance(by a resistor) of предназначан for introduction to the electric chains of pure resistance.

Superconductivity is property of some materials to possess strictly a zero electric resistance at an achievement by them temperatures of the below defined value(critical temperature). Several hundred and керамик, passing to the state, connections, clean elements, alloys, are known. Superconductivity is the quantum phenomenon. It is characterized also the effect of Мейснера consisting in the complete forcing of magnetic-field out of volume of superconductor. Existence of this effect shows that superconductivity