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Distinguish between conductors and insulators of electricity. - Physics

Distinguish Between

Distinguish between conductors and insulators of electricity.

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Solution 1

DISTINCTIONS BETWEEN CONDUCTORS AND INSULATORS OF ELECTRICITY:

CONDUCTORS INSULATORS
(i) They allow the current electricity to flow through them. Do not allow the current electricity to flow through them.
(ii) They have a large number of free electrons. They have a small number of free electrons.
(iii) All metals like Ag, Cu, iron, gold, wet wood etc. Cotton, dry wood, rubber, glass distilled water etc.
(iv) Conductors cannot be charged by rubbing. Can be charged by rubbing.

Solution 2

DISTINCTIONS BETWEEN CONDUCTORS AND INSULATORS OF ELECTRICITY:

Basis For Comparison Conductor Insulator
Definition Material which permits the electric current or heat to pass through it. Restrict the electric current or heat to pass through it.
Electric Field Exist on the surface but remain zero inside the conductor. Do not exit on insulator.
Magnetic Field Store energy Do not store energy
Potential Remain same at all the point on a conductor. Remain zero.
Thermal Conductivity High Low
Covalent bond Weak Strong
Conductivity Very high Low
Resistance Low High
Electrons Freely move Do not move freely
Resistivity Vary from high to low High
Temperature coefficient Positive temperature coefficient of resistance Negative temperature coefficient of resistance
Conduction band Full of electrons Remain empty
Valence Band Remains Empty Full of electrons
Forbidden gap No forbidden gap Large forbidden gap
Examples Irons, aluminium, silver, copper, etc. Rubber, Wood, Paper, etc.
Application For making electrical wires and conductor As insulation in electrical cables or conductor, for supporting electrical equipment etc.
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APPEARS IN

Selina Concise Physics Class 8 ICSE
Chapter 8 Electricity
Exercise 8 (B) (Short/Long answer questions) | Q 22 | Page 167
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