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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
Why 11.0592mhz crystal is used with 8051?
In some systems the CPU and bus timing is a limit to the highest and sometimes the lowest CPU clock frequency, so the clock needs to be stable enough to guarantee timing requirements are met according to the design and the specification.
Can you explain how a voltmeter and ammeter work?
In parallel with the element you wish to measure the voltage across.
Which of what following? The inductance of the coil must be higher than the resistance of the coil, since the supply is providing 200*10 = 2000VA.
2000VA =sqrt[ (I^2 * R)^2 + (I^2 * L)^2]
4000000VA = I^4*R^2 + I^4*L^2
400 = R^2 + L^2
and 1000Watts = R*I^2, so R = 10 ohms
400 = 100 + L^2
L = 17.3 ohms
Assembler directives in microprocessor?
Manual coding of 8086 is difficult hence we use a assembler or a compiler. Note that the microprocessor should be able to interpret your discussions via the program. Suppose if the instruction corresponds to word(16 bits), we use assembler directive WORD PTR, but when assembler is contacting the processor it sets a bit called 'w' indicating its a byte operation.
What is meant by sampling in analog to digital conversion?
while conversion of analog signal to digital signal, we need to convert continuous analog signal to discrete signal. this can be done by dividing the analog signal into specific time slots. this process is known as sampling. there is a condition for sampling that can be given as follows.
fs<=2fm
Light Emitting Diode (LED) & the Avalanche Diode. These are two types of diodes ,but there are more
What is the wave length of a 100MHz FM radio?
What is the wave length of 100 Hz? Answer You mean a sound wave in air. At a temperature of 20 degrees Celsius or 68 degrees Fahrenheit there is the speed of sound c = 343 meters per second. For a tone of f = 100 Hz the wavelength is lambda = c / f = 343 / 100 = 3.43 meters.
The equation for the relationship between wavelength and frequency is X = frequency * wavelength, where X = the speed of the particle. For light, the wavelength of 100 Hz is 2.99 E8 cm, and for sound, the wavelength is 60 m.
How do you connect diodes in series?
Connect positive to negative, leaving the end positive and negative connections free to power circuits or devices. Connecting batteries in series adds the voltage of the batteries. For instance, connecting three 12v car batteries in series will create a total of 36v, enough for welding.
What is induction and inductive reactance?
resistance is real, the other purely imaginary.
AnswerResistance is the opposition to the flow of current (AC or DC) which is proportional to a conductor's cross-sectional area and resistivity, and inversely proportional to its length. Reactance is the opposition to AC current due to either the circuit's inductance or its capacitance, and are termed inductive reactance and capacitive reactance. Resistance and reactance are both measured in ohms.
Inductive reactance is proportional to the circuit's inductance and the frequency of the supply; capacitive reactance is inversely proportional to the circuit's capacitance and the frequency of its supply. In other words, inductive reactance increases with frequency, whereas capacitive reactance decreases with frequency.
All AC circuits contain resistance, and most contain some degree of inductance and/or capacitance. So the opposition offered by a circuit to AC current includes resistance together with some combination of inductive and/or capacitive reactance.
It's incorrect to suggest that reactance is 'imaginary'in the every day sense of the word -it exists, so it must be 'real'. In this context, 'imaginary' is a mathematical term that indicates that if resistance and reactance were represented in a vector diagram (called an 'impedence diagram'), then reactance quantity would lie at right-angles to the resistance quantity. For this reason, the overall opposition to current flow, which is called impedance, is not the algebraic sum of resistance and reactance, but the vector sum of the two. So, for example, if a circuit had a resistance of, say, 4 ohms, and its inductive reactance was 3 ohms, then its impedance would be 5 ohms -not 7 ohms.
Although we can represent resistance and reactance using a vector diagram (impedance diagram), strictly-speaking the quantities themselves are not vector quantities. The impedance diagram is created as a result of a phasor (vector) diagram representing the current and voltage relationships in the AC circuit.
What does 60hz alternating current do?
Direct current (DC) electrical power from a battery has no phase reversal of the electron flow in the electrical circuit. Electrons always flow from the negative terminal to the positive terminal of the battery in the wires of the circuit.
In alternating current (AC), there is a periodic reversal of the flow of electrons (e.g. current) through the wires of the circuit. 60 Hertz refers to the frequency of that reversal of flow. 60 Hz is equal to 60 cycles per second. So AC current from your wall socket in the United States is reversing directions 60 times each second. The cycling is caused by design of the generators used in the power plants that produce the electricity. The current (polarity) reverses direction 120 times each second. Twice in each cycle on a 60 Hz system. Once to the positive and then once to the negative in one cycle.
When current flows through a wire what are they called?
Current flow is when charge moves from one point to another. It is measured in coulombs per second, which is more commonly known as amperes.
What is OR gate in logic gate?
1. NAND gate is used to invert the input A (by connecting A to both inputs).
2. NAND gate used to invert B the same way
3. Now put A' and B' into into a third NAND gate. The output will be (A'B')' which is equivalent to A+B.
What a device that protects an electric circuit from too much current?
Circuit Breakers and Fuses limit the amount of current flowing through the circuit.
Can you list three ways you can change the current in a circuit?
Increase, decrease, or remove the load
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Change the voltage and the current will also change in direct proportion, Ohms law.
What is the function of a filter capacitor?
This seems like a question from an electrical course, and is probably best answered by your course materials. It's your test question, not ours, and there won't always be someone to ask the answer of. Earn your diploma.
Why you use alternating current for long distances why not direct current?
we can step up different ranch by Alternating current. it is less voltage drop then d.c and a.c current is chi pest then dc current .
AnswerA.C. is more-widely used than d.c. because the voltage level of a.c. is easily increased to high voltages using transformers. High-voltage is essential for electricity transmission, as it results if a lower load current for a given load -thus reducing voltage drops, and enabling the use of conductors of lower cross-sectional area. However, d.c. is also widely-used for long-distance h.v. transmission, as it has several advantages over a.c. -e.g. less losses, and no synchronisation problems with other systems (making it ideal for international links). So, in some respects, d.c. is better than a.c. over long distances.
What is a transistor used for in a circuit?
Transistors are the fundamental building blocks of a computer, just as cells are the buildin blocks of any living organism. It is rare to find any individual transistors in a modern computer but every integrated circuit contains vast number of them. For example, every memory location will have a pair of trasistors, so there are 16 of them for each byte, so 16 million of them for each megabyte of memory. The central processor which carries out all the calculations and other processes also contains millions of transistors. As integrated circuits are developed, the size of each transistor gets smaller, so more can be packed into single chips but they are still doing the same job as the individual transistors that were used to build the very first solid state computers. To learn more about the way transistors operate in a computer, it is worth looking the way they are used to make simple logic gates. The basic gates such as OR, NOR, AND, NAND and various latches are used to create the powerful computers we take for granted today. A study of these gates will offer some insight into the way computers store, move and manipulate data using transistor technology.
Can you use fluorescent bulbs outdoor?
Can??? Sure, you'd just need to come up with a waterproof enclosure.
But the problem is, many fluorescent fixtures don't work well when the temperature drops. Yes you can use fluorescent fixtures outside, they should be approved for the purpose and make sure they have 0 degree rated ballast for cold weather starting. The new electronic type ballast work in cold weather with no problems.
How do you check a dc ammeter?
a dc ammeter is a ammeter which has three pins and it works by two wires.
What does a transistor look like?
Transistor is a three terminal device. Its shape may differ with applications.
How do you draw an open and close circuit?
Engineers often use 'models' to represent the behaviour of complicated devices such as machines. In the case of transformers, these 'models' are more-usually called 'equivalent circuits' -schematic diagrams, using simple resistors and inductors, to simulate the operation of the transformer, and to help us construct the transformer's phasor diagrams.
The simplest equivalent circuit, which can be considered a 'first approximation' of the transformer's behavioiur, is commonly called an 'ideal transformer', and only accounts for the transformer's ability to step up or step down the primary voltage and secondary current.
The 'second approximation' equivalent circuit, takes into account the core losses and magnetising current.
The 'third approximation' equivalent circuit takes into account the resistance and leakage reactance of the primary and secondary circuits, responsible for the regulation of the transformer, and it takes into account both the core losses and the copper losses. The 'third approximation' equivalent circuit, therefore, can be considered the most accurate equivalent circuit.
