Advertisements
Advertisements
Question
Which has more resistance:
a long piece of nichrome wire or a short one?
Solution
A long piece of nichrome wire has more resistance because the resistance of a conductor is directly proportional to its length, R α l.
APPEARS IN
RELATED QUESTIONS
On what factors does the resistance of a conductor depend?
Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.
What happens to the resistance as the conductor is made thinner?
What happens to the resistance as the conductor is made thicker?
A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?
How does the resistance of a conductor depend on:
temperature of the conductor?
What would be the effect on the resistance of a metal wire of:
increasing its diameter?
Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of a cylinder of length `'l'` and area of cross-section `'A'` . Hence derive the S.I. unit of electrical resistivity.
Resistance of a metal wire of length 5 m is 100 Ω . If the area of cross - section of the wire is `3 × 10^-7 "m"^2` , Calculate the resistivity of the metal .
The element used almost exclusively for filaments of incandescent lamps: