R3/ Req+3 = 10V x 1kΩ/720Ω+1kΩ = 5.81V Rth= Req//R3= 720Ω//1kΩ = 418.6Ω = 418.6 =419Ω 18. Derive the Thevenin equivalent of the circuit shown in Figure 7.48b. Vth= Vs x R3/R2+R3= 6V x 150Ω/75Ω+150Ω= 4V Rth= R2//R3 = 75Ω//150Ω= 50Ω Chapter 9 Alternating Current and AC Measurements 1.Calculate the period of the waveform shown in Figure 9.44. T= (4div) x 20 ms/div= 80 ms/div 2. Calculate the period of the waveform shown in Figure 9.45. T= (5div) x 100µs/div= 500µs/div 3. Calculate the period of the waveform
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Electrical Interview questions Electrical interview question: What is electric traction? Answer: Traction means using the electric power for traction system i.e. for railways‚ trams‚ trolleys etc. electric traction means use of the electricity for all these. Now a day‚ magnetic traction is also used for bullet trains. Basically dc motors are used for electric traction systems. Electrical interview question: How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil
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poles_________ each other. 8. What part does polarity play in the operation of an electric motor? 9. What part of a motor produces an inductive magnetic field within itself to facilitate the rotating motion? 10. What part does the frequency of alternating current play in the operation of an electric motor? 11. What would be the speed of a two pole motor operating on a 120 Volts 60 Hz power supply? 12. What are the five types of single phase motors used in the industry? 13. Which of the following
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expensive to make because it required rare materials on the other hand the induction motor needs but one power supply and can be made with inexpensive materials. The induction motor is powered by alternating current (AC) Tesla was one of the first to discover AC. He believed that it was better than direct current
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in a similar way and always come in pairs: every north pole is yoked to a south pole. 3. An electric current in a wire creates a circular magnetic field around the wire‚ its direction depending on that of the current. 4. A current is induced in a loop of wire when it is moved towards or away from a magnetic field‚ or a magnet is moved towards or away from it‚ the direction of current depending on that of the movement. While preparing for an evening lecture on 21 April 1820‚ Hans Christian
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Collection Technique .......................................................................... Cahier technique no. 158 Calculation of short-circuit currents B. de Metz-Noblat F. Dumas C. Poulain Building a New Electric World "Cahiers Techniques" is a collection of documents intended for engineers and technicians‚ people in the industry who are looking for more in-depth information in order to complement that given in product catalogues. Furthermore‚ these "Cahiers Techniques"
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are common and may appear to be different only because they are made by different manufacturers‚ analogue Multimeter must be able to measure dc and ac voltage‚ dc current and resistance. The oscilloscope graphs the instantaneous value of voltage versus time on the screen. The main usage of oscilloscope is to view the alternating current or ac waveform‚ so that waveform measurement can be made. The screen of the scope is divided by reticules into ten horizontal divisions and eight vertical divisions
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UNIVERSITY ENTRANCE EXAMINATION PHYSICS Duration : 2 hours Please read the following instructions carefully. 1. This paper is made up of 50 Multiple-Choice questions and comprises ELEVEN (11) printed pages. 2. Do not write on the question paper. 3. Answer all questions and indicate your answers on the answer sheet provided. Marks will not be deducted for wrong answers. 4. Do not take any paper‚ including the question paper or unused answer sheets‚ out of the examination
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changes are taking place in the electric energy industry worldwide. Many development came in this field to find how we can measure this energy effectively. First of all came conventional disc type energy meter in this interaction of flux produced by current coil and pressure coil create mechanical counter attached to spindle to which rotating disc is attached. Many times it becomes necessary to find out the energy consumption consumed by our house appliances we use. The project “ADVANCED ENERGY METER”
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deflection and bridge measuring methods The difference between analog and digital measurements The difference between moving iron and moving coil galvanometers How electrodynamic galvanometers work Altering the measuring range for measurements of current and voltage Principles for measuring power Measurement of apparent‚ reactive and active power Principles for measuring the power factor Measuring power factors Understanding how electrical work is measured Measuring electrical work Understanding
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