The Cold War, refers to the war between the United States and Russia. China could also be included in the definition. The Cold War, asâ¦ noted, existed because of differing political ideologies between the two powers. Basically, it was the Western Ideals of democracy against the Eastern communists.
Every material has an electrical resistance and it is the reason that the conductor give out heat when the current passes through it. Resistance is a measure of how much an object opposes the passage of electrons. The unit of electrical resistance is the ohm and it is represented by Ï. Every material has Resistance. Copper has a low resistance and wood has a high resistance. For example, a metre of copper has a resistance of only 1 Ohm but a metre of wood has a resistance of 10000000 ohm. We need resistance to reduce the flow of electrons through a circuit, so we can build resistors to behave as Electrical resistance.
Resistance refers to the property of a substance that impedes the flow of electric current. Some substances resist current flow more than others. If a substance offers very high resistance to current flow it is called an insulator. If its resistance to current flow is very low, it is called a conductor.