Can we select components voltage references randomly in order to write KVL? Why? In what situation we cannot select both current and voltage references randomly? Why? 7. Why independent KVL and KCL equations used? What happens if dependent equations are used? 5. 6.

The effective voltage of alternating current is __________ times its highest or peak voltage. Select one: A. .9 B. .707 C. 100% D. E=IXR

Compare alternative and direct currents by comparing their physical properties. (Explain alternans, cycles, periods, frequency terms during this comparison. Also in this comparison, explain the electron flow directions separately in alternating and direct current)

Refer to the circuit on the right. VEB = 0.7 V, when the BE junction is conducting. VECsat = 0.2 V B Vref = 2.2 V (Use two decimal places.) = ∞ VREF IL +5 V R LOAD Figure 2 a. What should be the value of R in ohms if IL is to be maintained at 146 mA under changing load conditions? b. In order to maintain this load current, what should be the maximum allowable load resistance in ohms?

A PMMC type meter has a full scale deflection of 10 mA. The resistance of the coil is 30 ohm. Then (1) shunt value for an Ameter of 50 A range and (2) Find the value of series resistance required for the range up to 500 V.

Q5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across Ri, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diode have? (Use constant voltage drop model for the Silicon diode) IN4001 Ry OV 10k) D IN4001

Three phase Bridge rectifier operated from a 380V, 50Hz source throughout three-phase Y/Y connected transformer with ration 2:1. The load current has continuous character with negligible ripples and average thyristor current of 15A. The circuit inductance per phase is 1.2mH. The rectified voltage due to overlapping angle is 90 % of that voltage when this angle is neglected. 1- How much will the voltage drop be due to circuit inductance * 2- How much will the dc average voltage Vdc(alpha) be. 3- How much will the firing angle be ? 4- The overlapping angle. 5- How much is the percentage change of the output dc power if the thyristors T2, T4 and T6 are replaced by three diodes D2, D4, D6. 6- How much will be the maximum RMS phase current for the mentioned in previous task circuit ( semi-converter). 7- If an additional of 1 mH inductances are added to the existing inductances in the phases , how much will the overlapping angle be. The dc load current is kept constant & the…

5.) In a parallel circuit: A) Each branch of the circuit must have the same potential difference B) Each branch of the circuit can have a different current C) Both of the above D) None of the above 5) 6.) A semiconductor is a material that: A) Has a resistance between a true conductor and a true insulator 6) B) Behaves like a conductor under certain conditions and an insulator at other times C) Both of the above D) None of the above

An ac resistance is higher than a dc resistance. True False

12. You plot the current-voltage characteristics of a new non-ohmic device, perform a curve fit, and discover the current as a function of voltage is given by the equation: I = (9Amp/volt")V² – (7Amp/volt) V (a). Perform calculations to find the slope of a line tangent to this curve when V = 4.15 volts. (b). Calculate the effective resistance of this device when V = 4.15 volts. This device is Non-Ohmic!