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प्रश्न
Why are copper and aluminium wires usually employed for electricity transmission?
उत्तर
Copper and aluminium wires are often used to transmit electricity because:
- Copper and aluminium are good conductors of electricity also have low resistivity.
- Copper and aluminium have a low resistance, which makes them good conductors of electricity.
- Wires can be made easily from these.
संबंधित प्रश्न
A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10−8Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?
Fill in the following blanks with suitable words:
Copper is a good .......... Plastic is an ..........
What is the general name of the substances having infinitely high electrical resistance?
Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?
Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.
Which has more resistance:
a long piece of nichrome wire or a short one?
Which has more resistance:
a thick piece of nichrome wire or a thin piece?
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:
length of the conductor?
What would be the effect on the resistance of a metal wire of:
increasing its temperature?
How does the resistance of a wire change when:
its material is changed to one whose resistivity is three times?
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 .
A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has an area of cross-section:
Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the ______.
The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10-8 Ω, find the length of this wire.
How will the resistance of a wire be affected if its
- length is doubled, and
- radius is also doubled ?
Give justification for your answer.
