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प्रश्न
What do you understand by the resistance of a wire?
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उत्तर
The obstruction offered in the flow of electrons (or current) by the material of the wire, is called its resistance.
संबंधित प्रश्न
Name a device that helps to maintain a potential difference across a conductor.
Define one coulomb charge.
Name a device that help to measure the potential difference across a conductor.
How is a voltmeter connected in the circuit to measure the potential difference between two points? Explain with the help of a diagram.
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: a current of 2 A flows through it for 10 s?
A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.
How does the resistance of a metallic wire depend on its temperature? Explain with reason.
A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is:
Assertion (A): Charges flow from higher potential to lower potential.
Reason (R): Current flows mainly due to the flow of electrons.
______ is work done per unit charge.
