special characteristics of heater coil. 3. A wire of resistance 4 ohms is bent to form a circle. What is the resistance between two diametrically opposite ends? 4. How does the resistance of a conductor change if its temperature is increased? 5. A current of 4A flows in a wire of resistance 60 ohms. Calculate electrical energy consumed in 2 minutes. 6. V-I graph for two resistors is given. Which of the two has minimum resistance? 7. Alloys are used in electrical heating devices rather than pure metals
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1800’s Thomas Edison had a vision to power the whole of New York using DC (direct current) that he developed‚ this idea was brilliant‚ but had one set back. A power station was needed every mile due to D.C. only flowing in one direction. This wasn’t a very practical form of electricity or cost effective‚ another idea or form of electricity was needed. Welcome Nikolas Tesla‚ he came up with the idea of AC (Alternating Current) with this form of electricity the flow of electric charge changes direction
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Company. On the 89 Liberty Street in Manhattan they had set up a laboratory for Tesla were he could make and design new devices for the company. One of his inventions that made his laboratory was a induction motor that ran on a alternating current and used polyphase current to make a rotating magnetic field to turn the motor. In 1888‚ Brown
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Watts R = Resistance = Ohms I = Current = Amperes E = Force = Volts 1-1 OHM’S LAW DIAGRAM AND FORMULAS E I E = I x R I = E ÷ R R = E ÷ I R Voltage = Current x Resistance Current = Voltage ÷ Resistance Resistance = Voltage ÷ Current POWER DIAGRAM AND FORMULAS P E I = P ÷ E E = P ÷ I P = I x E I Current = Power ÷ Voltage Voltage = Power ÷ Current Power = Current x Voltage 1-2 OHM’S LAW AND IMPEDANCE E = VOLTAGE (IN V) I = CURRENT (IN A) Z = IMPEDANCE (IN Ω) E
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all stations and evacuated passengers from the premises with help from CISF personnel‚ who guard the installations. The most common DC voltages are 600 V and 750 V for trams and metros The power output is supplied by 25-kilovolt‚ 50 Hertz alternating current through overhead catenary. (Approximately 150 KV will be required by 2016 covering 140 km line.) Delhi Metro‚ which consumes nearly 3 million megawatts of electricity per day‚ has managed to maintain the power charges per commuter at an average
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operate using vibration energy sources other than the standard charging mechanisms. As most of latest mobile phones are capable of charging from Universal Serial Bus (USB) we decided to design our circuit capable of supplying standard USB voltage and current rating. The circuit consists of a piezoelectric buzzer‚ a rectifier with a storage capacitor‚ an amplifier section‚ regulator and a switching mechanism that controls the energy flow into the battery. Experimental results showed that the method is
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Fundamentals of Electric Circuits (EE201) By Dr. Eng. Omar Abdel-Gaber M. Aly omar.aly@aun.edu.eg Assistant Professor Electrical Engineering Department College of Engineering Al-Majmaa Al-Majmaa University Schedule & Instructors Schedule: As indicated in Students Schedule Instructors: Dr. Omar Abdel-Gaber (omar.aly@aun.edu.eg) Office hours: Saturday (01:02 pm)‚ or by appointment. TAs: Eng. Mohamed AbdelRaheem Office hours: As indicated in
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A PROJECT REPORT ON VARIABLE POWER SUPPLY GUIDED BY Mrs. PALLAVI INGLE PREPARED BY DHARANG SHAH JIGNESH VYAS 10EC154 09EC065 DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING YEAR: 2010 DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING SAL INSTITUTE OF TECHNOLOGY AND ENGINEERING RESEARCH AHMEDABAD-380060 CERTIFICATE This is to certify that the following students of the third semester Electronics and Communication Engineering have successfully submitted the project
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chassis of the circuit. | battery | | | Supplies electrical energy. A battery is more than one cell. Generates constant voltage. Represents a battery in an equipment package. | resister | | | A resistor restricts the flow of current‚ for example to limit the current passing through an LED. A resistor is used with a capacitor in a timing circuit. | attenuator | | | A box with input and control logic on one side‚ and output on the other. | capacitor | | | A capacitor stores electric charge
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Have you ever done so much work and never given enough credit for it? This one man was never given enough credit due to fraud by Thomas Edison. This particular man was named Nikola Tesla. He had a mind ahead of his own time. Tesla was a Serbian-American physicist who was born on July 9‚ 1856 in Smiljan‚ Croatia. He was born during the Austro-Hungarian Empire. His father was Milutin Tesla‚ a preacher at the Serbian Orthodox Church. While his mother‚ Djuka Mandic‚ ran the family farm. When he was seven
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