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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 is microcontroller needed?
A microprocessor cant work as a stand alone unit.to make it work we have to interface memory and input out devices and so the PCB of microprocessor based system will be larger.Microcontroller consists of processor,memory and peripherals on a single chip and so needs no interfacing.Microcontroller can be programmed for any specific task.
There is only one possible answer.
Voltage = current * resistance
also, Power = Voltage * Voltage / resistance
If you follow the algebra, you should get a resulting resistance of the lightbulb to be 548.6 ohms.
How a characteristic impedance of 50ohm is matched with load impedance of 150ohms?
This is done using an impedance matching network (or filter), which is composed of multiple capacitors and inductors. Since these networks are made of capacitors and inductors, the matching networks are specific to a given frequency.
If you need to create one, I recommend referencing a book on electronic networks. There is usually a section on filters and passive filter designs that may give a step by step approach to developing one.
Also, you can create a filter using active components, such as operation amplifiers. The Op amps should be chosen with care to insure the desired frequency is attainable. This may be a simpler approach than developing a passive filter, depending on your requirements.
What is mechanical tilt in GSM antenna?
The Mechanical Tilt is given by physically tilting down the GSM antenna.
Tilting downward focuses the beam on a specific area and hence better coverage.
What is the importance of load factor in power system planning?
load factor is the ratio of average load to max demand for a given period.
High load factor means
- less cost per KWH
- more efficient use of power plant
How do you connect an ohmmeter in series or paallel?
A: To read ohms you will use it by reading in parallel and without any external voltage applied
Why are the brushes of DC motor motor made of carbon rather than copper?
Carbon is much stronger and because the motor commuter is spinning copper brushes will wear off quickly.
Does the magnetic field increase or decrease if the current is decreased?
An increase in an electrical current will cause magnetism to increase but a decrease in an electrical current will cause magnetism to decrease.
Real current refers to an analysis of the charges that actually flow - for example electrons in a metal - as opposed to the "conventional current", that uses a ficticious current of positive charges. If the electrons move to the left, the "conventional current" moves to the right. If positive charges (e.g. ions) move to the right, the conventional current also is to the right.
A Computer Output Electricity in Computercraft cannot be said to make a program to output power, regardless of the side.
A metal film capacitor is an electrical part that holds energy electrostatically inside of an electric field. The capacitor has a dielectric which separates two electrical parts which are made out of thin film.
What is AC rating DC rating wrt Relay contact or contact of contactor?
The contact rating is normally given in AMPs or HP and refers to the load the "switch" in the relay can handle. The manufacture will specify the relay contact rating in the data sheet. This rating depends on the current being controlled by the relay, the connection type (how the relay is mounted) and the duty. A Normally open relay in pilot duty (clicked closed all day) may be only 10% of the same relay in intermitted contact duty. DC current requires a higher contact rating then AC. For example a relay rated at 1A @ 24vdc should also handle 1A @ 120vac and as the voltage increases the contact rating will lessen.
The opposition to an alternating current offered by a coil, or inductor, is called impedance (symbol Z, measured in ohms) which, in turn, is made up of two components: resistance (symbol R) and inductive reactance (symbol XL). These three quantities are related as follows: Z2 = R2 + XL2.
The resistance of an inductor is a fixed value which depends upon the length of the coil's wire, the cross-sectional area of the wire, and the resistivity of the material from which the wire is made.
The inductive reactance of an inductor, on the other hand is directly proportional to the frequency of the supply. So, at high frequencies, an inductor's inductive reactance is very much higher than at low frequencies.
So, at high frequencies, the impedance of the inductor is higher because its inductive reactance is higher.
The current flowing through a coil is, by Ohm's Law: I = V / Z. So, at high frequencies, the inductor's impedance will be much higher than at low frequencies, which means that a very much smaller current will flow when the frequency is high compare to when the frequency is low.
Ref: Website of Hershey Energy Systems Triplen Harmonics - The triplen harmonics, in alternating current power systems, are defined as the odd multiples of the 3rd harmonic (ex. 3rd, 9th, 15th, 21st etc.). Triplen harmonics are of particular concern because they are zero sequence harmonics, unlike the fundamental, which is positive sequence. The consequence of this fact is that the magnitude of these currents on the 3 phases are additive in the neutral. Edited the original to add: ", in alternating current power systems, "
What is the construction of compound microscope?
simply in construction we just have to consider the eye piece and objective lens.The objective lens iz that lens of reflected beam of light froom the object or specimen[ordinary light].its focal length iz small.the reflected ray then passes through the eyepiece of large focal length which then iz reflacted by our eye and we see that object or spcimen. so its construction includes only the two lenses.it can be best explained 2 u by the RAY DIAGRAM.
Who invented 28 different electronic devices?
checkout http://teacher.scholastic.com/activities/bhistory/inventors/boykin.htm
A: It is a regular DC voltmeter but the AC is rectified and the DC component is measured and displayed as AC VOLTS.
ozone is the layer of the atmosphere where the ultraviolet rays of the sun are blocked because ultra violet rays of the sun when the skin too much exposed to it cause skin cancer.
See also "How does ozone affect human health?" in the "Related questions" section below.
What is the purpose of a three way light bulb?
The three way light bulb has two filaments with one common pin. The common pin is connected to the shell of the base, while the other pins are at the center and the ring. The three way fixture then provides four positions; neither, one, the other, or both of the filaments receiving power. This way you can adjust the brightness. Maximum power is always the sum of the other two power settings; such as 50-100-150, 30-70-100, etc.
Also, a very common light bulb which has two filaments is used in the "stop and tail" lamps on cars, trucks and many other vehicles. Its two filaments are: 5 watts for the tail light function and 21 watts for the stop light (or turn signal) function. Each filament is connected to its own separate pin inside the insulated center of the shell of the base of the bulb.
From there, via the bulb holder, the 5 watt filament is connected to the light switch which connects it to the positive side of the battery for the tail light function.
Similarly the 21 watt filament is connected to the stop light switch - operated by the brake pedal - which connects it to the positive side of the battery for the stop light function.
The other side of each filament is connected directly to the metal shell, so the shell is the common connection point to the negative side of the battery. Some of the newer versions of this bulb have a plug in base with four terminals, of which two are common, making it impossible to mis-socket this bulb.
How does electrical current flow in a circuit?
There is a potential difference (voltage) between two points and a path for electrons to travel from an area of low potential (negative) to an area of high potential (positive). Note the direction of "current flow" is opposite the direction of electron flow. In other words current flows from positive to negative. In a circuit involving only a resistor, the current flowing in the circuit is given by I=V/R where I = current, V= voltage, and R=resistance.
Why GaAs is preferred to Si for high temperature operation of semi-conductor device?
GaAs has high mobility compare to Si
What is Use of monostable multivibrator?
A partial clue to the answer is in its name, Monostable. i.e. it has one stable state.
This is, in most monostables, a low, or "zero" state.
When a monostable receives a trigger, it produces one output pulse, the width (duration) of which is determined by the suitable choice of associated components.
Once the pulse has ended, the monostable returns to its stable state, ready to be triggered again.
The most common use is for 'de-bouncing' switch contacts.
Mechanical switches rarely make a clean contact first time. With modern high speed electronics, the 'crackle' from switch contacts can be detected as many separate presses of the switch. Follow the switch with a monostable and it will only detect one press over a short period of time.
Is light emitting diodes emit visible light when forward biased?
It depends on the particular LED. Some of them emit infrared light. But, yes, emission occurs when forward-biased.
What are advantages and drawbacks of carry look ahead circuit?
uning of carry look ahead circuit they work to stop over flow and the addition perform well
