Advertisements
Advertisements
Question
Classify the following into good conductors, resistors and insulators:
Rubber, Mercury, Nichrome, Polythene, Aluminium, Wood, Manganin, Bakelite, Iron, Paper, Thermocol, Metal coin
Solution
Conductors: mercury, aluminium, iron and metal coin
Resistors: nichrome and manganin
Insulators: rubber, polythene, wood, paper, thermocol and bakelite
APPEARS IN
RELATED QUESTIONS
On what factors does the resistance of a conductor depend?
Why are alloys commonly used in electrical heating devices? Give reason.
Fill in the following blanks with suitable words:
Copper is a good .......... Plastic is an ..........
Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?
Which has more resistance:
a long piece of nichrome wire or a short one?
What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10−6 m2 if the resistivity of the metal be 2.8 × 10−8 Ω m?
Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7 × 10−8 Ω m.
How does the resistance of a conductor depend on:
temperature of the conductor?
How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistors R1, R2 and R3 in series connected to a battery of V volts?
The element used almost exclusively for filaments of incandescent lamps:
