(i) Define electric current. State its SIunit.
(ii) State the factors on which the resistance of cylindrical conductor depends.
(iii) A given length of a wire is doubled on itself and this process is repeated once again.By what factor does the resistance of the wire changes?
Answers
Explanation:
(i) Define electric current. State its SIunit.
An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. ... The SI unit of electric current is the ampere, or amp, which is the flow of electric charge across a surface at the rate of one coulomb per second.
(ii) State the factors on which the resistance of cylindrical conductor depends.
Factors on which the resistance of a cylindrical conductor depends: (i) Area of a cross-section of the conductor. (ii) Nature of the material. SI unit of resistivity is ohm-m.
(iii) A given length of a wire is doubled on itself and this process is repeated once again.By what factor does the resistance of the wire changes?
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Answer:
(i) net rate of flow of electric charge past a region. The SI unit of electric current is the ampere.
(ii) • Length of the conductor
• Area of cross-section of the conductor.
• Nature of the material.
(iii) Resistance of a wire is directly proportional to the length of the wire. As its length increases it's resistance increases. If it is doubled again, the length of the wire becomes 4L and it's resistance becomes 4x.