- United States Navy Electricity and Electronics Training by Topic
- Navy Electricity and Electronics Training Series (NEETS), Module 16 - RF Cafe
- The Navy Electricity and Electronics Training Series: Module 19 The Technician's Handbook
- Construction Topics
To continue with the above example, if you use a The right conclusion to draw, though, is to discuss and purchase generators using the KVA requirements, not the KW. The illustration above shows that the power factor is a number between 0 and 1. Some typical power factors are shown below:.
United States Navy Electricity and Electronics Training by Topic
As you can see, power factors can vary widely depending on the loads. So why does that matter? Power companies don't like supplying the apparent power requirements but only getting paid for the true power that's used. So an industrial plant with a low power factor has to have lots more energy supplied to it than it pays for, creating an inefficiency for the power companies. As you can imagine, power companies tend to prize efficiency, so they typically bill that industrial client with the low power factor a penalty to encourage them to improve. Under-loaded induction motors often lower a power factor, so an industrial plant may replace those motors with smaller capacity motors or going with synchronous motors.
I had rented a 25 KVA diesel generator for a factory we were building in the middle of nowhere.
Navy Electricity and Electronics Training Series (NEETS), Module 16 - RF Cafe
That old generator just ran and ran When the service guys came out and asked me when I'd last checked the oil, I gave them that dumb blank stare. Then I responded with the pitiful, "But you never told me I needed to check the oil. If you need to provide temporary electric on a jobsite, diesel, gasoline or propane generators often solve the problem.
Trying to determine the size generator you need can also be a challenge.
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The big difference in current draw for motors starting vs just running should be noted. I was also surprised how much energy computers use. The first decision concerns the fuel used to power the generator; the normal options are diesel, natural gas or propane. Deciding which items will be powered in a power outage determines the size of the generator, typically in KVA. The location of the proposed generator leads to the type of housing required. As an interesting aside, I came across instructions to build the world's simplest generator.
The Navy Electricity and Electronics Training Series: Module 19 The Technician's Handbook
You may want to kill some time playing around with this or help a kid with a science project or some such thing. This simple device clearly shows the definition of an electric generator as a device that changes mechanical energy into electrical energy. On the other hand, a motor changes electrical energy into mechanical energy. A transformer transfers electrical energy from one circuit to another by magnetic coupling.
In other words, the number of coils on the primary side of a transformer create a magnetic field when a current passes through it. Therefore, the secondary side of the circuit, with a different number of coil windings, will have a different voltage. The modern use of electricity requires that very high voltage, low current flows travel the long distances between the electrical generation source and the point of use.
In almost any modern use of electricity, several voltage increases and decreases will occur. Since transformers are extremely efficient, there are few losses between their input power and output power. The electrical power portion of most buildings will include metering, switchgear and distribution panels. A Construction Supervisor should have a basic understanding of what these elements do. The metering allows the power company to keep track of how much electricity gets used.
The largest amount of electricity used at one time the Demand and the power factor also are important on buildings that have more inductive loads like motors. Then a main breaker will be required in the switchgear, allowing the entire electrical system to be turned off. From this main breaker, the current flows through circuit breaker panels and sub-panels. Typically a one line diagram shows the general concept of the electrical power system and includes metering, switchgear and panels.
A fuse or circuit breaker protects the wiring in an electrical circuit from allowing too much current to flow. A short circuit, for example, could be caused by two wires mistakenly crossed a nail driven through the wall and touching two wires that could cause a huge current flow and start a fire.
Without fuses and circuit breakers, electrical circuits would simply catch on fire too many times for electricity to be considered a safe and practical energy to use. Since equipment will fail and wiring problems will happen, fuses or circuit breakers need to be included in circuits for safety. Fuses work on the simple concept that when current flows through wire it generates heat, the more current flow, the more heat.
The thin wire in a fuse will only allow a certain amount of current to run through it until it heats and disintegrates. The thin wire in the fuse is now gone and no current can flow the circuit. When current was flowing through the fuse and the rest of the circuit, it was a closed circuit, but when the fuse blows, it becomes an open circuit. No current flows in an open circuit. So fuses work well, but they only work one time. After the wire in a fuse burns out, that fuse must be removed and thrown away and a new fuse must be installed.
The circuit breaker accomplishes the same function as a fuse, but uses a simple switch to detect over-current situations. Therefore the circuit breaker can trip and be reset many times. Follow the link for a slightly more detailed explanation about how circuit breakers work. How the heck should I know? I plan and build buildings for a living. I did find some interesting US Navy training courses that provide a tremendous amount of useful information. The intro to the course follows:. Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study.
The presentation of this series is not oriented to any specific rating structure, but is divided into modules containing related information organized into traditional paths of instruction. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material. For a student just becoming acquainted with electricity or electronics, it is highly recommended that the modules be studied in their suggested sequence. While there is a listing of NEETS by module title, the following brief descriptions give a quick overview of how the individual modules flow together.
Module 1, Introduction to Matter, Energy, and Direct Current introduces the course with a short history of electricity and electronics and proceeds into the characteristics of matter, energy, and direct current dc. It also describes some of the general safety precautions and first-aid procedures that should be common knowledge for a person working in the field of electricity. Related safety hints are located throughout the rest of the series, as well. Module 2, Introduction to Alternating Current and Transformers is an introduction to alternating current ac and transformers, including basic ac theory and fundamentals of electromagnetism, inductance, capacitance, impedance, and transformers.
Module 3, Introduction to Circuit Protection, Control, and Measurement encompasses circuit breakers, fuses, and current limiters used in circuit protection, as well as the theory and use of meters as electrical measuring devices. Module 4, Introduction to Electrical Conductors, Wiring Techniques, and Schematic Reading , presents conductor usage, insulation used as wire covering, splicing, termination of wiring, soldering, and reading electrical wiring diagrams.
Module 5, Introduction to Generators and Motors is an introduction to generators and motors, and covers the uses of ac and dc generators and motors in the conversion of electrical and mechanical energies. Module 6, Introduction to Electronic Emission Tubes, and Power Supplies ties the first five modules together in an introduction to vacuum tubes and vacuum-tube power supplies.
Module 7, Introduction to Solid-State Devices and Power Supplies is similar to module 6, but it is in reference to solid-state devices. Module 8, Introduction to Amplifiers covers amplifiers. Module 9, Introduction to Wave-Generation and Wave-Shaping Circuits discusses wave generation and wave-shaping circuits. Module 10, Introduction to Wave Propagation, Transmission Lines, and Antennas presents the characteristics of wave propagation, transmission lines, and antennas. Module 11, Microwave Principles explains microwave oscillators, amplifiers, and waveguides. Module 12, Modulation Principles discusses the principles of modulation.
Module 13, Introduction to Number Systems and Logic Circuits presents the fundamental concepts of number systems, Boolean algebra, and logic circuits, all of which pertain to digital computers. Module 14, Introduction to Microelectronics covers microelectronics technology and miniature and microminiature circuit repair. Module 15, Principles of Synchros, Servos, and Gyros provides the basic principles, operations, functions, and applications of synchro, servo, and gyro mechanisms. Module 16, Introduction to Test Equipment is an introduction to some of the more commonly used test equipments and their applications.
Module 17, Radio-Frequency Communications Principles presents the fundamentals of a radiofrequency communications system. Module 18, Radar Principles covers the fundamentals of a radar system. Module 19, The Technician's Handbook is a handy reference of commonly used general information, such as electrical and electronic formulas, color coding, and naval supply system data.
Module 20, Master Glossary is the glossary of terms for the series. Module 21, Test Methods and Practices describes basic test methods and practices. Module 22, Introduction to Digital Computers is an introduction to digital computers. Module 23, Magnetic Recording is an introduction to the use and maintenance of magnetic recorders and the concepts of recording on magnetic tape and disks.
Module 24, Introduction to Fiber Optics is an introduction to fiber optics. Embedded questions are inserted throughout each module, except for modules 19 and 20, which are reference books. If you have any difficulty in answering any of the questions, restudy the applicable section. Although an attempt has been made to use simple language, various technical words and phrases have necessarily been included. Specific terms are defined in Module 20, Master Glossary. To understand analog signals, think about a microphone. The sound pressure from your voice causes an element in the microphone to vibrate.
Over time that element moves with a different frequency cycles per second and amplitude distance it moves or wavelength. So an analog signal is a time continuous signal that has wavelength and frequency. The stylus on a record player picks up the variations in the groove that are analogous to the actual sounds. That's where the term "Analog" comes from.
The human hear also works in an analog manner, determining the in real time the vibrations that carry frequency and wavelength of the sound. Digital signals, on the other hand, are just a series of 0s and 1s. The pattern of these 0s and 1s called a binary system convert an analog signal which is the physical properties of the sounds into bits of information that can be stored, transmitted and converted back into an analog signal. The accuracy of the conversion the quality of the sound depends on the sampling rate how often the sound gets converted and the sampling depth how much information is included in each conversion.
Think of a low quality photo from a cheap cell phone camera, the sampling rate and depth is low, so the quality of the photo is poor. Conversely, a 5 Megapixel digital camera provides an extremely clear photo. Another key difference between digital signals and analog signals is that digital signals don't operate in real time like an analog signal. Your ear hears that sound pressure and converts it to an analog signal in real time, as the sound happens. Digital sound gets stored in bits of information and needs to be converted back to analog real time whether in an image or a sound to make sense to our analog selves.
A standard clock illustrates the principle in another way.
As the second hand sweeps the dial and the minute and hour hands slowly move, the clocks acts as an analog device. It works continuously through time. So you can look at an analog clock and know the time is 1 minute and 37 seconds after Har kan du enkelt spara foton fran handelser i ditt liv som du vill minnas, bade de stora sakerna och de sma7 Mar Instruction Manual Baratron b manual transmission Series ultra small form factor btx Mks baratron b manual high school The.
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