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The temperature dependence of resistance is also quantified by the relation
where
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- The construction of PV solar cells uses a number of critical elements. One is indium an ingredient of the transparent conducting coating on the surface of the cell. The average material intensity for indium in solar cells is approximately 0.05 kg/kWnom. Calculate the quantity of indium that would be required for a project that would provide PV solar power with capacity factor of 0.25, sufficient to meet one third of the present needs of the US, population 301 million, each using an average of 10.2 kW. The current world production of Indium is 600 tones per year. If the solar project were to be implemented over a 5 year time span, is it true that the supply of indium be adequate?arrow_forwardA silicon iron ring is wound with 800 turns, with a mean diameter of 120 mm and a cross-sectional area of 400 mm2. If, when carrying a current of 0.5 A, the relative permeability is found to be 3000, calculate (a) the self-inductance of the coil, (b) the induced e.m.f if the current is reduced to zero in 80 ms.arrow_forwardThe outer radius of a coaxial cylindrical electrode system is given in 32 cm. The system is the most suitable sized according to puncture. Penetration of the insulator between the cylindrical layers Its strength is Ed = 72 kV / cm and the relative dielectric constant of the insulator is Er1 = 10 a) - Calculate the capacity of the system and get the highest possible application without puncture to the system. Please respect what the voltage should be b) - For the case of U = 120 kV application, the maximum and minimum occurrence on the system Calculate the electric field values?arrow_forward
- If the dark saturation current of a solar cell is 1.7X10-8 A/m2, the cell temperature is 27 oC, and the short-circuit current density is 250 A/m2, Vmax = 0.526 V, calculate the open-circuit voltage, Voc; current density at maximum power, Imax.arrow_forwardfor the circuit in the FIG. (a) suppose that the elements of the circuit have values such that √(1LC)> R/2L. For t > 0, calculate the instantaneous power dissipated in the endurance. Express your result in terms of V, R, L, C or appropriate function of these that you define. (d) What is the total energy dissipated (t → ∞) in the resistor? *consider: R = 500Ω L = 10mH C = 1μF. at t > 0 the switch is open and the voltage across the components is zero (except on the battery). At t = 0 the switch is closedarrow_forwardA resistive touch screen has 640 pixels in the x-direction and 1024pixels in the y-direction. The resistive grid has 8 V applied in both the xandy-directions. The pixel coordinates at the touch point are (480, 192). Suppose the resistive touch screen described above is simultaneously touched at two points, one with coordinates (480, 192) and the other with coordinates (240, 384).1. a) Calculate the voltage measured in the x- and y-grids.2. b) Which touch point has your calculation in (a) identified?arrow_forward
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- Q.1) given the system y(n) = sin[x(n)]deside which of the following properties this systemholds and explain- memoryless- stable- causal- linear- time invariantarrow_forwardfor the circuit in the FIG. (a) suppose that the elements of the circuit have values such that √(1LC)> R/2L. For t > 0, calculate the instantaneous power dissipated in the endurance. Express your result in terms of V, R, L, C or appropriate function of these that you define. (b) What is the total energy dissipated (t → ∞) in the resistor? *consider if necessary: R = 500Ω L = 10mH C = 1μF. at t > 0 the switch is open and the voltage across the components is zero (except on the battery). At t = 0 the switch is closedarrow_forwardAn electric radiator is required to dissipate 1kW when connected to a 230V supply. If the coils of the radiator are of wire 0.5mm in diameter having resistivity of 60 michro olms cm, calculate the neccesary length of the wire.arrow_forward
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