What is the time constant of this system 2x = -8x + 5 ? a) 4 sec b) 0.25 sec c) -4 sec d) -0.25 sec
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- You are a journeyman electrician working in an industrial plant. Your task is to connect an inductor to a 480-V, 60-Hz line. To determine the proper conductor and fuse size for this installation, you need to know the amount of current the inductor will draw from the line. The nameplate on the inductor indicates that it has an inductance of 0.1 H. An ohmmeter reveals that it has a wire resistance of 10 . How much current should this inductor draw when connected to the line?You are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?The true value of a current is 10mA and it is indicated with a digital ammeter as 12mA. The absolute error for this measurement system is mA. O a. 2 O b. 0.16 C. -2 O d. 0.2
- what's dimensions the formulaAn (open) electrical circuit consists of an inductor, a resistor, anda capacitor. There is an initial charge of 2 coulombs on the capacitor.At the instant the circuit is closed, a current of 3 amperes ispresent and a voltage of E(t) = 20 cos t is applied. In this circuitthe voltage drop across the resistor is 4 times the instantaneouschange in the charge, the voltage drop across the capacitor is10 times the charge, and the voltage drop across the inductor is2 times the instantaneous change in the current. Write an initialvalue problem to model the circuit.The magnitude of the voltage applied to the electrodes of a welding machine can be adjusted in the circuit below. In the range of minimum and maximum value that variable value resistor can take What is the time interval that the capacitor will charge from 0 to 8 V?
- (2= 6.3x10 12. the figure shows a simple RC circuit consisting of a 100-V battery in series with a 10-μF capacitor and a resistor. Initially, the switch S is open and the capacitor is uncharged. Two seconds after the switch is closed, the voltage across the resistor is 37 V. How much charge is on the capacitor 2.0 s after Ve=V₂ (1-e / RC) 6-3 = 1010 (1-c = ²2²) the switch is closed? -2x105 a. 1.1 x 10-³ C b. 2.9 x 10-3 C C. 3.7 x 10-4 C d. 6.3 x 10-4C e. a. 63 = 1- e b. b. C. 1-e-R 5.2 x 10-4 Chex100 = 1n 37 R -20 -2x105 R =-.994 100 V Causes it to rotate about an axis prallel to the Z-axis. is zero Causes it to rotate about an axis prallel to the x-axis. d. none of these. e Causes it to rotate about an axis prallel to the y-axis. 374 R R=2011 56.1908 The figure shows a rectangular coil carrying a steady current (1). There is a separate, external magnetic field pointing toward the right and parallel to the x-axis. Notice that thet he z-axis is out of the page. The torque on the coil:…1 RC circuits You would like to make a simple timer that will sound a buzzer one minute after a switch in an RC circuit is closed. You design a buzzer so that it will sound when the charge on a capacitor falls below 20% of it's initial value. You are using 200nF capacitor. How large of a resistor do you need? www RThe circuit in Figure has been connected for a long time. If the battery is disconnected, how does it take the capacitor to discharge to 1/20 of its initial voltage? Take R₁ = 2.00 Q, R₂=4.00 Q, R3-7.00 Q, R4 = 2.00 Q and C= 5.00 uF and ε = 14.0 V. (Your result must be in us. Include 2 digit after the decimal point and maximum of 2% of error is accepted in your answer.) E R₂ R₂ BA
- Compute the time constant of the circuit below in units of ms (Do not enter units in the solution box, only the value) Switch to 2 k. 15V C= 4 uFa.) What is the resistance in the circuit a long time after the switch is closed? b.) What is the current through both resistors a long time after the switch is closed? c.) What is the current through the inductor a long time after the switch is closed?A voltage of 6 cos(100rt) V is fed as y-input to a CRO. The waveform seen on the screen of the CRO is shown in the figure. The Y and X axes settings for the CRO are respectively