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Suppose uniusulated copper or aluminium ...

Suppose uniusulated copper or aluminium wires are used for flow of electricity from pole to pole in the street. Do you expect a better flow in summer or winter and why?

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To answer the question regarding the flow of electricity through uninsulated copper or aluminum wires in summer versus winter, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Uninsulated Wires**: - Uninsulated wires are those that do not have any protective coating. This means that the temperature of the wire can directly be influenced by the surrounding environment. 2. **Effect of Temperature on Conductivity**: ...
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Explain the following: (a) Why is the tungsten used almost exclusively for filament of electric lamps? (b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal? (c ) Why is the series arrangement not used for domestic circuits? (d) How does the resistances of a wire vary with its area of cross sections? (e ) Why are copper and aluminium wires usually employed for electricity transmission?

Knowledge Check

  • Metals like copper, aluminium and silver allow electricity to flow through them. They are good conductors of electricity. Other substances like plastic, rubber and cloth do not allow electricity to flow through them. They are insulators and are grouped under non-metals. Similarly, some metals like iron, copper, aluminium and steel get heated easily. They are good conductors of heat. Non-metals like paper and wood do not get heated easily. These are poor conductors of heat. Metals are malleable, ductile and sonorous. The reason for putting the handle of wood is

    A
    if the handle is made of another metal, it will not get hot
    B
    if the handle is made of another metal, it will not look good
    C
    if the handle is made of wood, it will not get hot
    D
    if the handle is made of wood, it will get hot.

  • Metals like copper, aluminium and silver allow electricity to flow through them. They are good conductors of electricity. Other substances like plastic, rubber and cloth do not allow electricity to flow through them. They are insulators and are grouped under non-metals. Similarly, some metals like iron, copper, aluminium and steel get heated easily. They are good conductors of heat. Non-metals like paper and wood do not get heated easily. These are poor conductors of heat. Metals are malleable, ductile and sonorous. Which of these materials would you choose to make a bell for temple?

    A
    Plastic
    B
    Copper
    C
    Wood
    D
    Glass

  • Metals like copper, aluminium and silver allow electricity to flow through them. They are good conductors of electricity. Other substances like plastic, rubber and cloth do not allow electricity to flow through them. They are insulators and are grouped under non-metals. Similarly, some metals like iron, copper, aluminium and steel get heated easily. They are good conductors of heat. Non-metals like paper and wood do not get heated easily. These are poor conductors of heat. Metals are malleable, ductile and sonorous. Steel spoons used for cooking get easily heated, so, Handles of steel spoon should be made up of

    A
    copper
    B
    iron
    C
    wood
    D
    aluminium

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    Metals like copper, aluminium and silver allow electricity to flow through them. They are good conductors of electricity. Other substances like plastic, rubber and cloth do not allow electricity to flow through them. They are insulators and are grouped under non-metals. Similarly, some metals like iron, copper, aluminium and steel get heated easily. They are good conductors of heat. Non-metals like paper and wood do not get heated easily. These are poor conductors of heat. Metals are malleable, ductile and sonorous. Which metal is used to make foils for wrapping food material?

    Assertion : The transfer of electrons from zinc to copper takes place through metal wire connecting the two rods. Reason : Electricity from solution in one beaker to other flows by migration of ions through the salt bridge.

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    Mohan is a student of class 6 . One day , his science teacher taught him electricity . After that, he had many doubts about the electical appliances and measuring devices that are used in his home . He observed that a wire from an electric pole is connected to a joule meter. A , fixed to the walll in the veranda, and from there to a main switch , and then to the main fuse, a refrigerator, a fan and a bulb are connected in parallel. Find out the appliance that consumes the least electric power among them.

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