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A doorbell is connected to a transformer whose primary contains 3000 turns and which is connected to 120 VAC. If the doorbell requirs 0.2 A at 10 V, find the number of turns necessary for the second
Audio amplifiers use transformer coupling between the final amplifier stage and a speaker to match impedances and in order to avoid having DC current of the final stage flow through the speaker coil
An analog LTIC system with impulse response function h(t) = u(t+2) - u(t-2) is presented with an input x(t) = t(u(t) - u(t-2)). a) Determine and plot the the system output y(t) = x(t)*h(t). b) Is this
a filamentary conductor carrying current I in the z direction extends along the entire z axis. At z=0 it connects to a copper sheet that fills the x>0 and y>0 quadrant of the xy-plane. Set up
A) the required step-up voltage ratio for satisfactory performance. B) the voltage ratio of a standard buck-boost transformer that most closely meets the requirements of the load. C) the voltage at th
An autotransformer with a total of 600 turns has its secondary windings embracing 200 turns. The 600 turns are connected to a 60-Hz, 2400-V driving voltage. A load connected to the secondary draws 4
Design a cascade of two lowpass L-networks to optimally mathc Rs=50 ohm to RL = 5k ohms at 10MHz frequency. Choose network parameters to maximize overall bandwidth.
Design a common-emitter bandpass amplifier having 20dB voltage gain at frequency 1.6 MHz with a bandwidth of 80kHz, when driven by an ideal voltage source and loaded at the output by RL=100k ohm and
Consider a circuit consisting of a sinusoidal source vs(t) = cos(t)u(t) volts connected in series to a resistor R and an inductor L and assume that they have been connected for a very long time. (a)
it is found experimentally that electric field in certain region of earth's atmosphere is downward. at an altitude of 300m the field is 58N per C and at altitude of 200m it is 110N per C. Find the n
Let E = y ax V/m at a certain instant of time, and calculate the work needed to move a 3 C charge from (1,3,5) to (2,0,3) along the straight line segment joining: a.) (1,3,5) to (2,3,5) to (2,0,5) t
An electric field is expressed in rectangular coordinates by E = 6x2ax + 6y ay +4az V/m. Find: a.) VMN if point M and N are specified by M(2,6,1) and N(-3, -3, 2). b.) VM if V = 0 at Q(4, -2, -35)
Design a full wave rectifier as dc power supply with a 1kΩ load that operates from a 120Vrms, 60Hz supply through a 10 to 1 step down transformer. The capacitor is connected to parallel to the
Design a half-wave rectifier as a dc power supply that delivers 0.2A and 15V peak values to a load. The ripple voltage is to be no more than 0.4V peak to peak. The rectifier is led from the voltage
The load absorbs 30 kW at 0.8 power factor lagging. The line impedance is (1.4 + j 1.6) ohms per phase between generator G1 and the load, and (0.8 + j1.0) ohms per phase between generator G2 and the
A spectrum analyzer is used to verify an FM signal with a carrier frequency of 100.3 MHz, a modulation frequency of 15 kHz, and a modulation index of 2.4. a.) Predict the spectrum-analyzer display f
Given the electric field E = 1/z2 (8xyz ax + 4x2z ay - 4x2y az) V/m, find the differential amount of work done in moving a 6 nC charge a distance of 2 µm, starting at P(2, -2, 3) and proceedin
A 50 µF capacitor, when connected in series with a coil having 40 ohms resistance, resonates at 1000 Hz. Find inductance of the coil. Also obtain the circuit current if the applied voltage is
1) For a semiconductor E vs kx near the band edge Ec is given by E=Ec +(h2/16m0)*kx2. Determine the effective mass of electrons in the conduction band. Here m0 is the mass of a free electron.
(a) Determine the values of the voltage and current phasors in polar form. (b) Calculate the instantaneous voltage at a time 0.8 ms after it crosses the zero-value axis in a positive going direction.
A "Clock" pulse for a flip-flop could be generated by manually filpping a switch from 0 to 1 and then back to 0. but switches such as those on the logic designer "bounce" when switched from on state
Design the low pass filter with the 3 dB point at 1Khz. DC gain is 0 dB. use the C value as 100 uf and input ac magnitude 1 V. use the AC simulation between 1 mHz to 1 Khz.
Derive the expression for the equilibrium concentration of holes/cm^3 in the valence band, p0, starting with the density of states in the valence band and the Fermi-Dirac distribution.
Two identical 138 kV Y: 13.8 kV DELTA 100 MVA tap changing transformer each with a per unit series impedance of j.1 ohms are operating in parallel and supplying a 180 MVA load at 13.8 kV and .8 lagg
In the spectrum of a complicated in the time domain biological signal we observe ten prominent frequency components with a lot of leakage around them. Where is this leakage in the frequency domain m