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 thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature by correlating the resistance of the RTD element with temperature.Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core.latinum was proposed by Sir William Siemens as an element for resistance temperature detector at the Bakerian lecture in 1871: it is a noble metal and has the most stable resistance-temperature relationship over the largest temperature range.