Teach Yourself. Electricity and. Electronics. Third Edition. Stan Gibilisco. McGraw -Hill. New York Chicago San Francisco Lisbon London Madrid. Mexico City. Power Transformers Isolation and Impedance Matching Radio- Frequency Transformers Quiz Test: Part 2 Part 3 Basic Electronics. In Teach Yourself Electricity and Electronics, Fifth Edition, a master teacher provides step-by-step lessons in electricity and electronics fundamentals and.
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This number is resistance and inductive reactance. Ferromagnetic pot core constant? This transformer is Ans: Characteristic impedance is complex. The product of the rms ac through capacitor and the rms voltage across it. All of the above Ans: It will increase.
The line loss Ans: Reducing the power output of the source. PART 2 Ans: The frequency. Germanium Ans: Ability to withstand high voltage spikes. Poor regulation under heavy loads. You can assume that this fuse Ans: A television broadcast transmitter Ans: All of the above transformer. What is the approximate dc output voltage with no load? A capacitor in parallel and a choke in series. Connecting multiple diodes in parallel.
A forward biased PN junction. The E-B junction is reverse biased. The common source circuit. The output power is 33 W. Which of the following statements is true? The gate nonlinear. Under what conditions is the output of the resulting black box TEST 3 is low? None of the above.
SSTV signals. What is this mode? How many possible input combinations are there? If and only if both inverter inputs are low. Serial Ans: The collector is negative relative to the emitter.
Polarization modulation. Negative feedback. A Gunn diode. D layer. Common Emitter. LSB Ans: A layer of intrinsic semiconductor can be Ans: At which of Ans: The folded dipole.
Which of the following logical expressions respresents the content of the black box?
This phenomenon is represents most of the total system resistance. LED and a photodiode. FM transmission line and an antenna tuner. Suppose this loop is circular. A zepp antenna numerous ground radials. What is the efficiency of this system? Capacitors and Diodes of Ans: Ability to handle extremely high power. C Ans: The final amplifier in a large radio broadcast transmitter.
All three Resistors. A comparator. Transistor-transistor logic Ans: The capacitance among the electrodes.
A Ans: Lower gain. Four Ans: None of the above apply. An epipolar navigation system.
They both involve measurement of distances the grounded grid circuit to determine the location of a receiver Ans: A piezoelectric transducer. All of the above microphone.
Forget it! No form of acoustic wave can travel power output. An optical shaft encoder. Advertise used cars for sale.
They are specifically designed to reproduce States using a ham radio station? A computer with a telephone modem. A portable CD player. Which of Ans: The speakers are capable of handling the amplifier output. Digital audio is compatible with vinyl disks Ans: You can check your reasoning as you tackle a problem using our interactive solutions viewer.
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Hit a particularly tricky question? Bookmark it to easily review again before an exam. The best part? However, this can be a quite peculiar movement, and sometimes engineers speak of the movement of holes rather than electrons. A hole is a shortage of an electron—you might think of it as a positive ion—and it moves along in a direction opposite to the flow of electrons Fig.
Static electricity 15 When most of the charge carriers are electrons, the semiconductor is called N-type, because electrons are negatively charged.
When most of the charge carriers are holes, the semiconducting material is known as P-type because holes have a positive electric charge. But P-type material does pass some electrons, and N-type material carries some holes.
In a semiconductor, the more abundant type of charge carrier is called the majority carrier. The less abundant kind is known as the minority carrier. Semiconductors are used in diodes, transistors, and integrated circuits in almost limitless variety. These substances are what make it possible for you to have a computer in a briefcase. That notebook computer, if it used vacuum tubes, would occupy a skyscraper, because it has billions of electronic components. It would also need its own power plant, and would cost thousands of dollars in electric bills every day.
But the circuits are etched microscopically onto semiconducting wafers, greatly reducing the size and power requirements. Whenever there is movement of charge carriers in a substance, there is an electric current. Current is measured in terms of the number of electrons or holes passing a single point in one second. Usually, a great many charge carriers go past any given point in one second, even if the current is small. In a household electric circuit, a watt light bulb draws a current of about six quintillion 6 followed by 18 zeroes charge carriers per second.
Even the smallest mini-bulb carries quadrillions numbers followed by 15 zeroes of charge carriers every second. It is ridiculous to speak of a current in terms of charge carriers per second, so usually it is measured in coulombs per second instead. A coulomb is equal to approximately 6,,,,,, electrons or holes.
A current of one coulomb per second is called an ampere, and this is the standard unit of electric current. A watt bulb in your desk lamp draws about one ampere of current. When a current flows through a resistance—and this is always the case because even the best conductors have resistance—heat is generated.
Sometimes light and other forms of energy are emitted as well. A light bulb is deliberately designed so that the resistance causes visible light to be generated. Even the best incandescent lamp is inefficient, creating more heat than light energy. Fluorescent lamps are better. They produce more light for a given amount of current. Or, to put it another way, they need less current to give off a certain amount of light.
Electric current flows very fast through any conductor, resistor, or semiconductor. In fact, for most practical purposes you can consider the speed of current to be the same as the speed of light: , miles per second. Actually, it is a little less. Static electricity Charge carriers, particularly electrons, can build up, or become deficient, on things without flowing anywhere. An excess or shortage of electrons is created on and in your body. You acquire a charge of static 16 Basic physical concepts electricity.
It is the current, during this discharge, that causes the sensation that might make you jump. If you were to become much more charged, your hair would stand on end, because every hair would repel every other. Like charges are caused either by an excess or a deficiency of electrons; they repel. The spark might jump an inch, two inches, or even six inches. Then it would more than startle you; you could get hurt. But a device called a Van de Graaff generator, found in some high school physics labs, can cause a spark this large Fig.
You have to be careful when using this device for physics experiments. This spark is just a greatly magnified version of the little spark you get after shuffling around on a carpet. Until the spark occurs, there is a static charge in the clouds, between different clouds or parts of a cloud, and the ground. In Fig. In the case at B, the positive charge in the earth follows along beneath the thunderstorm cloud like a shadow as the storm is blown along by the prevailing winds.
The current in a lightning stroke is usually several tens of thousands, or hundreds of thousands, of amperes. But it takes place only for a fraction of a second.
Still, many coulombs of charge are displaced in a single bolt of lightning. When the charge builds up, with posi- Electromotive force 17 Cloud-to-cloud A and cloud-to-ground B charge buildup can both occur in a single thunderstorm. It is often abbreviated EMF.