0
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
To answer these questions I will tell you which devices or equipments are inductive.
These include:
- Transformers
- Hair clipers,hair blowers,
- motors
You hopefully know what those devices or equipments are used for,hence why we use inductors.
Why must a satellite have a distinct up link and down link frequencies?
These are frequencies used for satellite communications.
Usually in the Gigahertz bands.
Uplink is on a differenct channel to downlink, to avoid interferece.
The Uplink, is the signal sent to the satellite, via a dish antenna, which focuses the signal in the direction of the satellite.
On board the satellite, this signal is changed and re-transmitted, on a different frequency (Downlink), and beamed back to earth.
This way huge distances can be covered on earth, despite the curvature and with minimal power.
Advantages of intermediate frequency?
The intermediate frequency, or IF, in a superhetrodyne receiver is used to tune the desired signal.
The IF stage is tuned to a specific, fixed frequency, usually 455 kHz for AM and 10.7 MHz for FM. Since the IF stage does not need to be adjustable, it can be designed for high performance, tight bandpass operation.
This is far easier to do than creating an adjustable RF stage with tight bandpass operation. Instead, the RF stage is broadband and the IF stage is narrow band.
The actual tuning of the receiver is done by varying the local oscillator that is mixed with the radio frequency (RF) signal just upstream of the IF stage. The difference frequency of the output of the mixer is then amplified by the IF stage.
The audio information, to be fed to an amplifier and be heard on the speaker, is extracted after the last IF stage - either by a detector in AM or discriminator in FM.
What happens to the current flow in a circuit when a second component is added in series?
The total current decreases.
According to the Ohm's law the current & the resistance are inversely proportional so when we put a load in series with the existing load, the resistance of the circuit increases therefor the current decreases.
What is a line to line voltage?
In a 3 phase system, the voltage measured between any two phase is called line to line voltage.
And the voltage measured between line to neutral is called phase to neutral (line to neutral) voltage.
AnswerThere is no such thing as a 'phase-to-phase' or a 'phase-to-neutral' voltage. The correct terms are 'line-to-line' and 'line-to-neutral'.
The voltage between any two line conductors is called a line voltage.
In a three-phase, three-wire, system, the line voltage is numerically equal to the phase voltage.
In a three-phase, four-wire, system, the voltage between any line conductor and the neutral conductor is called a phase voltage. The line voltage is 1.732 times larger than the phase voltage.
Can you combine two generators circuits together?
Proton LED engineer in Lyons GA says: the two circuits would have to be in phase in order to combine them.
*Actually you can always combine generator circuits. The problem comes in with HOW in phase the circuits are. If the generators are in phase (0 degrees apart) their AC voltages and currents would combine completely, but if they are out of phase (90 degrees apart) the voltages and currents will appose each other to such an extent that they will basically cancel each other out. The trick is to apply some sort of phase correction to one of the circuits in order to modify the phase difference between the two so that you can get the desired power output. Just be careful not to exceed your rated line currents when combining two generator circuits, otherwise things could get smoky! - Tristan JvR
Why are motors lamps and other resistors considered a loads in electrical circuits?
Because they use electrical energy to produce mechanical energy or heat energy
Is Capacitor linear or nonlinear?
A: capacitor behaves as a linear element as the current is independent of voltage across it. current (as o/p) varies as the time rate of change of voltage across it. so capacitor rarely shows appreciable non linearity, if it is operated in the specified voltage limit
Why are LEDs different lengths?
To make it easier to see which is positive - anode, and which is negative - cathode.
You need to know that, because the LED will only light if the positive and negative
terminals of the battery are connected to the correct sides of the LED.
3
3 ohms
What are examples of conductors in your home?
A semiconductor is a substance, usually a solid chemical element or compound, that can conduct electricity under some conditions but not others, making it a good medium for the control of electrical current. Every consumer electronic device uses this technology.
Radio signals are broadcast by what waves?
Radio waves are electromagnetic waves. Electromagnetic waves include waves such as X rays, ultraviolet light, visible light, infrared rays and so on, but you probably imagine radio waves to be quite different from these waves. Of the various kinds of electromagnetic waves, radio waves have a longer wave length than infrared rays, and are defined by the Radio Law as 'electromagnetic waves with a frequency of less than 3,000 GHz (3 THz)'
Ultralow frequency radio waves
below 3kHz
radio waves
3kHz~
3THz infrared rays
3THz~
380THz visible light
380THz~
790THz ultraviolet light
790THz~
105THz X rays
105THz~
107THz γ rays
above 107THz
Names of radio waves Frequency Wave length Principal applications VLF(Very Low Frequency) 3kHz ~ 30kHz 100km ~ 10km LF(Low Frequency) 30kHz ~ 300kHz 10km ~ 1km Vessel / Airplane beacon MF(Medium Frequency) 300kHz ~ 3MHz 1km ~ 100m AM radio, Marine radio, Amateur radio HF(High Frequency) 3MHz ~ 30MHz 100m ~ 10m Shortwave broadcasting, Marine / Air radio, Amateur radio VHF(Very High Frequency) 30MHz ~ 300MHz 10m ~ 1m TV, FM, Fire radio, Police radio, Disaster PA radio network UHF(Ultra High Frequency) 300MHz ~ 3GHz 1m ~ 10cm Low power radio, Mobile-phone, Taxi radio, Amateur radio, TV, Wireless LAN SHF(Super High Frequency) 3GHz ~ 30GHz 10cm ~ 1cm Satellite broadcasting, Radar EHF(Extremely High Frequency) 30GHz ~ 300GHz 1cm ~ 1mm Satellite broadcasting, Radio astronomy, Radar submillimeter waves 300GHz ~ 3THz 1mm ~ 0.1mm
Is better to work at 4 ohms or 8 ohms?
There is really no 4 ohm or 8 ohm amplifier on the market with an output impedance of 4 or 8 ohms for power matching. You will find there 0.4 ohm or less for voltage bridging. There is really no 4 ohm or 8 ohm amplifier on the market with an output impedance of 4 or 8 ohms for power matching. You will find there 0.4 ohm or less for voltage bridging.
A: A zener is a diode that when connected in the reverse mode current direction it will breakdown to a predetermined voltage any further increasing voltage the breakdown will remain practically the same.
What are the characteristics of gray code?
Due to grey code it is less chance to clamp Wrong....
if something is wrong then due to color code it is identified,,
Presuming the question is about Gray Codes, aka reflected binary code, the primary benefit is that it requires only a single binary digit to change when incrementing or decrementing a binary number.
That is, the Grey Code representation of X (base 10) has N binary digits in it. The Grey Code representation of either X-1 or X+1 requires only a single binary digit to change, out of the N digits which make up the number. Normal binary code can require up to all N digits to change when adding or subtracting a single increment.
The advantage here is cleanliness, in particular for mechanical and electrical circuits. Since it is impossible to absolutely synchronize change of digits, in a normal binary representation of a number, incrementing or decrementing it can leave the number in a variety of intermediary states, of which an outside observer cannot tell which is correct. This can cause all sorts of problems when constructing working devices, that otherwise appear to be perfectly designed in the abstract.
For a better explanation of the mechanics and usefulness of Gray Code, look at the Wikipedia article below.
How many amps does a ceiling fan use?
Between 0.5 - 0.9 amps (not including the energy for the light bulbs) depending on the make and model.
What is the application of voltage quadruppler?
A: A doubler can increase a low voltage to a very high voltage by adding stages the application is study of high voltage behavior to plasma study to entertainment of globe arcing to ions generators to eliminate odors
Why does the free electron theory fail to predict the semiconducting properties of materials?
Drawbacks of Classical free electron theory:
1. It is macroscopic theory
2. This theory cannot explain the electron conductivity of
semiconductors and insulators.
3. Ferromagnetism cannot be explained by this theory.
4. This theory cannot explain the Photoelectric effect, Compton
effect and the Black Body radiation.
5. The calculated value of specific heat of metals is not matching
with the experimental value.
6. At low temperature, Lorentz number is not a constant. But by
12
classical theory it is a constant.
7. Dual nature cannot be explained.
8. Atomic fine spectra cannot be explained.
9. Classical theory states that all the free electrons will absorb
energy, but quantum theory states that only few electrons will
absorb energy
It increases. The time constant of a simple RC circuit is RC, resistance times capacitance. That is the length of time it will take for the capacitor voltage to reach about 63% of a delta step change. Ratio-metrically, if you double the resistance, you will double the charge or discharge time.
It depends on the losses in the inverter, the only accurate method would be to measure the voltage and current going into the inverter and calculate from there. However i'd imagine the losses from the inverter would be pretty low, so not much more than 180-200W at an estimate
Does current actually flow through a capacitor?
No. Current (or more specifically, charge) flows into one plate, and an opposing current (charge) flows out of the other plate, but the current (except for leakage current) does not flow across the dielectric. The result is that there is a charge differential between the plates.
What are the workings of a regulator?
Fan regulators have an important place in the electrical switch boards. Fan regulators are very similar to light dimmers.Their function is to regulate/control the speed of the fan and provide a convenient environment for the residents.
The traditional regulators which are bulky use a resistance having taps and connected in series with the fan. When we move the knob different amount of resistance gets inserted in the circuit. Although cheap the biggest problem with such a regulator is that a considerable amount of energy is lost in form of heat through the resistance. When the fan is operating at low speed the power loss is significant.
The technologically superior electronic regulators overcome these problems by using electronic components to control the speed of the fan.
Some of the advantages of electronic fan regulators are:
1. They provide a continuous speed control.
2. Power saving at all the speeds.
3. Smaller size and weight.
The heart of the electronic fan regulator is TRIAC. TRIAC is a semiconductor device belonging to the family of thyristors.
