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Define lattice.

Important Questions on Electric Current

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What is a superconductor?

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Define the unit of current.
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What are superconductors?
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If the valence electrons exactly fill one or more bands, leaving other empty, then the crystal will be 
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What is superconductivity?
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Define lattice space.
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A space lattice is an array of points showing how particles are arranged at different sites in _____ dimensional spaces.
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At critical temperature, a metal offers _____ resistance to the passage of electricity.
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A substance has zero resistance below 1 K. What is such a substance called?
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Assertion: The resistance of a superconductor is zero.

Reason: Superconductors are used for the transmission of electric power.
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The temperature below which a conductor offers no resistance to the flow of electric current is known as its critical temperature.
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A space lattice is an array of points showing how particles are arranged at different sites in three dimensional spaces.
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Look at the picture of a thermos flask showing five of its most important features. 

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What is the function of the vacuum in the thermos flask?

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At absolute zero, Si acts as
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What are Superconductors?
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In the adjoining figure, the reading of ammeter A is not zero, while that of voltmeter V is zero. The substance C is,

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What is critical temperature? Explain its importance in superconductors.
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The super conductors are used to levitate trains from the track.
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Cotyledons are also called-
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What is a superconductor? Give one example of it.