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Power companies have to maintain the rms voltage level at each customer's location. Assume the acceptable deviation is +- 5.8%. Thus, a nominal rms voltage of 120 V will range from 113 to 127 V. Suppose the line to line voltage at Customer A is 13.8kV, the load at customerA consumes complex power (1.2+j1.2)x 10^6 W.
Customer A is connected to a power plant via a three-phase line and each phase line has the impedance of 1.8+j14.4.
a) What line to line voltage at the plant is needed to generate a line to line voltage of 13.8 kV at the customer.
b) Could the voltage create problems for other customers requiring 13.8V?
What do the letters PCM and PAM stand for? Why is PCM transmission preferred over PAM transmission? Give at least two reasons in your answer.
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A silicon sample at T = 300 K contains an acceptor impurity concentration of \(N_{A}\) = 1016 cm-3. Determine the concentration of donor impurity atoms that must be added so that the silicon is n-type and the Fermi energy is 0.20 eV
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The Problem: An Electric Heater is connected to a constant 250-V source and absorbs 1000 W. Subsequently, this heater is connected to a constant 210 V source.
A generator provides the following voltage signal: v(t) = 2 + 3 sin(100pi) + 4 cos(250pi). Find the average value of the function. Note: pi = 3.1416 in this equation.
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