I. Answer the following: 1. Define Thermoelectric effect. 2. State Seebeck effect. 3. Define Peltier effect. 4. Why Nichrome is used as Electric heating device? 5. Find the heat energy produced in a Resistance of 20 ohm when 10A current flow through it for 10 minutes (model 2.27) 6. What are the application of Seebeck effect? 7. What are application of joule's heating effect? 8. Explain the Thomson effect. please answer these questions. DO NOT SPAM
Answers
Answer:
1. The effect is caused by charge carriers within the material diffusing from the hotter side to the cooler side, similarly to the way gas expands when it is heated. The thermoelectric property of a material is measured in volts per Kelvin.
2. Seebeck effect production of an electromotive force and consequently an electric current in a loop of material consisting of at least two dissimilar conductors when two junctions are maintained at different temperatures.
3. Thermoelectric coolers operate according to the Peltier effect. The effect creates a temperature difference by transferring heat between two electrical junctions. A voltage is applied across joined conductors to create an electric current. Heat is deposited at the other junction.
4. Because of its low cost of manufacture, strength, ductility, resistance to oxidation, stability at high temperatures, and resistance to the flow of electrons, nichrome is widely used in electric heating elements in applications such as hair dryers and heat guns.
5. Given that,
Resistance, R = 10 ohms
Current, I = 5 A
Time, t = 5 min = 300 s
Due to flow of electric current, a certain amount of heat energy will be produced. It is given by the formula in this image :
So, the heat energy produced in the resistance is 75 kJ. Hence, this is the required solution.
6. The Seebeck effect is used to measure temperature with great sensitivity and accuracy and to generate electric power for special applications.
7. The heating effect of current is utilised in the working of electric heating appliances such as electric iron, electric kettle, electric toaster, electric oven, room heaters, geysers, etc.
8. Thomson effect, the evolution or absorption of heat when electric current passes through a circuit composed of a single material that has a temperature difference along its length. This transfer of heat is superimposed on the common production of heat associated with the electrical resistance to currents in conductors.
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