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What is the role of free electrons in conductors?

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Important Questions on Electricity

MEDIUM
Science>Physics>Electricity>Conductors and Insulators
Which of the following is a feature of insulators?
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Science>Physics>Electricity>Conductors and Insulators
What is the primary function of an insulator in circuits?
EASY
Science>Physics>Electricity>Conductors and Insulators
What does the conduction of electron depends upon?
MEDIUM
Science>Physics>Electricity>Conductors and Insulators
Which of the following is a good conductor of electricity?
MEDIUM
Science>Physics>Electricity>Conductors and Insulators
Which of the following is an application of conductors?
MEDIUM
Science>Physics>Electricity>Conductors and Insulators
Which of the following is a poor conductor of electricity?
EASY
Science>Physics>Electricity>Conductors and Insulators
Why are insulators used in electrical wiring?
EASY
Science>Physics>Electricity>Conductors and Insulators
Electric conduction in a semiconductor takes place due to
EASY
Science>Physics>Electricity>Conductors and Insulators
What property makes rubber a good insulator?
HARD
Science>Physics>Electricity>Conductors and Insulators
What distinguishes a conductor from an insulator?
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Science>Physics>Electricity>Conductors and Insulators
Why are metals better conductors than non-metals?
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Science>Physics>Electricity>Conductors and Insulators
What determines the conductivity of a material?
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Science>Physics>Electricity>Conductors and Insulators
Which material is used as a conductor in overhead power lines?
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Science>Physics>Electricity>Conductors and Insulators
Which material is an insulator?
MEDIUM
Science>Physics>Electricity>Conductors and Insulators
In a semiconductor 
EASY
Science>Physics>Electricity>Conductors and Insulators
Why do conductors heat up when current flows through them?
EASY
Science>Physics>Electricity>Conductors and Insulators
In conducting materials electrons are _____ bounded with atoms.
EASY
Science>Physics>Electricity>Conductors and Insulators

In the following figure, a battery of 2 volt is connected between A and B. It is assumed that the resistance of a diode is zero in forward bias and infinite in reverse bias. If positive terminal of the battery is connected to A, then the current flowing in the circuit will be,

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HARD
Science>Physics>Electricity>Conductors and Insulators
Why is copper commonly used in electrical wiring?
EASY
Science>Physics>Electricity>Conductors and Insulators
Which of the following is not an insulator?