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Suppose there are two transformers between your house and the high-voltage transmission line that distributes the power. In addition, assume that your house is the only one using electric power. At a substation the primary of a step-down transformer (turns ratio = 1:26) receives the voltage from the high-voltage transmission line. Because of your usage, a current of 48.0 mA exists in the primary of this transformer. The secondary is connected to the primary of another step-down transformer (turns ratio = 1:36) somewhere near your house, perhaps up on a telephone pole. The secondary of this transformer delivers a 120 V emf to your house. How much power is your house using? Remember that the current and voltage given in this problem are rms values.
For a particular amplifier connected in a feedback loop in which the output voltage is sampled, measurement of the output resistance before and after the loop is connected shows a change by a factor of 100.
Many communication systems connecting computers employ a technique known as "packet transmission." In this type of system, a collection of binary digits (perhaps 1000 of them) are grouped together and transmitted as a "packet."
Identify the bus types and the unknown variables of the power flow problem. Write the complete set of equations needed to solve the load flow problem.
The battery has 2.5 V output voltage and 12 Ohm internal resistance. The battery is used to boot a small electric motor with 145 Ohm resistance. Find the power delivered to the motor.
A 11 GHz uniform plane wave with maximum electric field of 100 V/m propagates in air in the direction of a x-direction. The magnetic field has only a a(z) component ( in the z direction), which is approximately equal to 100 mA/m at x = y = t = 0.
In a digital audio system, a digital to analog converter reproduces the analog voltage levels represented by the digital samples. This signal is inherently jagged with sharp transitions between each sample.
The source-free circuit depicted in Fig. 9.1 is constructed using a 10mH inductor, a 1mF cPcitor, and a 1.5k ohm resistor. a) Calculate alpha, omega-sub-delta, and omega-sub-zero. b) write the equation which describes the current i for t>0.
A balanced three-phase load is connected to a balanced three-phase supply via a transmission line. What must be the readings on the two wattmeters, the ammeter, and the voltmeter
Derive a state diagram for a Finite State Machine(FSM) that has an input w and an output z. The machine has to generate z = 1 when the privious four values of w were 1001 or 1111; otherwise, z = 0. Overlapping input patterns are allowed.
Design an inverting amplifier with a gain of -12 that has an input impedance that is larger than 100K that can drive a 2K resistive load using bipolar transistors. Verify your design analytically and with SPICE.
During an all-night cram session, a student heats up a 0.491 liter (0.491 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.7 °C, and the beaker is filled to the brim.
Calculate the instantaneous power absorbed by the resistor, the instantaneous power absorbed by the capacitor, the real power absorbed by the resistor, the reactive power delivered by|the capacitor, the load power factor.
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