# Fewgewf Essay

1119 words - 4 pages

New Era UniversityCollege of Engineering and TechnologyEE211- EE Technology 2Thursday (1:00-5:00)Laboratory Job No.1:"Voltage and Current Checking of an AC Generator"Salac, Aljon F. Rating:2nd Year BSEEReynaldo Dela CruzINSTRUCTOREE211EE Technology 2Thursday (1:00-5:00)Laboratory Job No.2"Voltage and Current Checking of an AC Generator"ObjectiveTo familiarized with AC generator.To check the voltage and current output of an AC generator.Equipment1-DWM1-VOM4-Connecting wires alligator clips (big wire)4-Connecting wires banana plug (big wire)ProcedureCheck all connecting wires for open and check the calibration of all measuring instrument.Connect the circuit shown in Fig 1.1.Turn ON the prime mover (3 induction motor).Close the main circuit breaker and turn ON load switch no.1.Using DWM, measure and record the total voltage, current and power.Turn ON load switch no.1 and no.2 and repeat procedure no.5Using procedure no.5 for load switches 1,2,3; load switches 124 and 1-5 and complete table 1.1.From the name plate of AC generator, find and record all rated values like KW, KVA, volt, amp, RPM, etc.From current date, solve for the branch current of each load I1, I2, I3, I4 and I5.Compute and record the average of the voltage.Compute and record the average of current.Compute and record the average of VA.Circuit DiagramData and ResultTABLE 1.1Measured Values

V (volt)

I (amp)

P (watt)

1

268V

0.34A

89W

1,2

270V

1.32A

345W

1,2,3

271V

2.45A

644W

1,2,3,4

266V

4.60A

1208W

1,2,3,4,5

269V

6.13A

1648W

Computed Values

Remark
a)

b)

c)

Question/ProblemBy Internet research: research aboutAC generatorTypes of AC generatorManufacturer and SpecificationAn alternating current generator, or AC generator, produces an alternating current, which means the voltage produced alternately reverses from positive to negative polarity, producing a corresponding change in the direction of current flow.Much like a DC generator, an AC generator requires a coil to cut across the force lines of a magnetic field. This coil is attached to two slip rings, which deliver the current to and from the load destination, thus completing the circuit. Alternating current generators are often called alternators.During the first half turn, the coil cuts across the field near the magnet's north pole. Electrons travel up the wire, and the lower slip ring becomes positively charged. When the coil cuts near the South Pole of the wire during the second half turn, the lower slip ring becomes negatively charged, and electrons move down the wire. The faster the coil turns, the faster the electrons move, increasing the frequency (in Hertz) of the current produced by the generator.INDUCTION GENERATORSAn induction generator or asynchronous generator is a type of AC electrical generatorthat uses the principles of induction motors to produce power. Induction generators operate by mechanically turning their rotor faster than the synchronous...

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