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For a lamp we want two wires; you are the neutral wire as well as the other is the live wire. These two wires are connected through the lamp for the main supply panel. It is advisable to use different colours for live wires and neutral wires. The universal practice is to use along with red for live wires as well as a black colour for the neutral wire. For switching ON and OFF the lamp we need a control known as a switch - provided inside live wire between the main supply and lamp. If the switch is ON, the electric circuit is closed and also the lamp glows, and if the switch is OFF, it'll disconnect the ability supply on the lamp. For safe operation this wiring is positioned in a box known as a switch box. The switch wire and live wire certainly are a single wire; it's just cut among for connecting the switch. In case you want to change the lamp, don't forget to switch OFF the lamp and if possible disconnect the electricity supply towards the circuit.
Early pneumatic tyre, use is made of coated with rubber canvas when tire body, because the canvas ordinate and horizontal lines cross each other, due to the deformation of the tire when walking, lead to rub against each other, in this way, the line is easy to be ground breaking, the tires can only run 200-300 km. In 1903, Mr. J. f. palmer invented the twill textile, which led to the development of cross - layer tires, making the tyre life a big step forward. Because the tire of the skew fork will no longer cause friction because of the tread of the tyre, the cord will not be easily worn out, so the life span will be considerably longer. In 1930, Michelin made the first tyre without a tyre. The world famous meridian tire was invented in 1946. Therefore, the development of the tire has been a long journey, in this long night, I do not know how many generations have paid hard labor and excellent wisdom
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