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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

Adding a DC source to a square wave signal?

Adding a DC source to a square wave signal will alter the base line of the wave without changing the peak-to-peak value.

For example, if a square wave has a +4V baseline and a +2VDC source is introduced, the resulting square wave will have a +6V baseline. This of course will also affect the high and low peaks of the signal. Assuming that our example has a high peak of +9V and a low peak of -1V (with a total of 10V peak-to-peak), the added +2VDC source would result in a high peak of +11V and a low peak of +1V; however, the total peak-to-peak value remains unchanged at 10V peak-to-peak.

How do you make a 16 ohm speaker 8 ohm?

You cannot make a 16 ohm speaker into an 8 ohm speaker. You would need to replace the voice coil. You can, however, put two 16 ohm speakers in parallel, and the equivalent impedance would be 8 ohms. The only remaining issue is frequency response, and that's a factor of speaker and enclosure design, so best is to use the exact speaker as originally designed.

How many pins does a 7805 IC have?

The 7805 regulator IC has three pins; input, output, and ground. The case is also a pin, but it is grounded, so there are still only three pins, for all practical purposes.

Where reactive power is used which is released in another part of ac voltage cycle as you have reactive power is power that is stored in one part of the AC voltage wave and released in another?

single phase induction motor

is really a two phase motor

a capacitor to one of the phases stores the reactive power

releasing it to the coil 90 degrees later

setting up the rotating magnetic field

that stores reactive power in the rotor (or the shorted windings of the rotor)

releasing it as it turns

Is there any theory that can calculate that how much heat can be produced from a convex lens?

A convex lens cannot produce heat. It can focus incident heat to a smaller area so that it is more intense.

What is value of astrocom reel to reel player model 407?

idk but u have to go to heyxd.com it is soooo kewl! u can talk to ur friends and play games and create smiles and pix!! best of all its totally safe!!

What are the factors that may change the electromotive force in any circuit?

Electromotive force (emf, ) is a term used to characterize electrical devices, such as voltaic cells, thermoelectric devices, electrical generators and transformers, and even resistors. For a given device, if an electric charge Q passes through that device, and gains an energy W, the net emf for that device is the energy gained per unit charge, or W/Q. This has SI units of volts, or joules per coulomb, and hence can be thought of as a voltage induced by the device in question. Since force has the SI unit of the Newton, "electromagnetic force" is a misnomer, but one that over time has resisted change. In most circuits current is driven by a so-called "source of emf", which usually is a voltaic cell (or battery, which consists of voltaic cells in series and/or in parallel) or the power company. For a voltaic cell the source of emf is the chemical reactions that occur at each of the electrode-electrolyte interfaces, so that a voltaic cell can be thought of as two "surface pumps" of atomic dimension. The reactions at the electrode-electrolyte interfaces provide the "seat" of emf for the voltaic cell. For the power company, the source of emf is electromagnetic induction, which is more extended than an atomic size, but nevertheless is confined to the power generation building, usually many miles from the user. Sources of electromotive force include electric generators (both alternating current and continuous current types), batteries, and thermocouples (in a heat gradient). Electromotive force is often denoted by or ℰ (script capital E). Electromotive force is measured in volts (in the International System of Units equal in amount to a joule per coulomb of electric charge). Electromotive force in electrostatic units is the statvolt (in the centimeter gram second system of units equal in amount to an erg per electrostatic unit of charge).

Do speakers need ventilation?

Not ventilation per say. but it needs an opening for the simple fact when it moves back and forth the same air transfers is coupled to the back too. without it it may resonate as some frequency by back pressure.

2 What is Pinch-off voltage of JFET?

To find out the qualitative response to changes in Vgs and Vds, consider Vgs =0. In response to a small applied voltage Vds, a n-channel JFET acts as a simple semiconductor resistor and Id increases linearly with Vds. With increasing current, the ohmic voltage drop between the source and the channel region reverse biases the junction and the conducting portion of the channel begins to constrict. because of the ohmic drop along the length of the channel itself, the constriction is not uniform but is more pronounced at distances father from the source. Eventually, a Vds is reached at which the channel is "pinched off". At this voltage, Id begins to level off. and approach a constant value. It is not possible for the channel to close completely and reduce Id to zero. If that were the case, then the ohmic drop required to provide the back biasing would be lacking.

Id is not equal to zero at Pinch off voltage.

Thus, pinch off voltage can be defined as the gate reverse voltage that removes all the free charge from the channel.

Is mixing the same as amplitude modulation?

No, mixing is adding two signals together, modulation is more like multiplying two signals. IN mixing, the result has the same frequencies as the input signals. In modulation, the result is the sum and difference frequencies.

Is ttl combinational circuit or sequential circuit?

it can be either, depending on parts used in the circuit and their connections.

What is advantage of space vector pwm in ac drive does it give better torque then normal pwm does it give benifit to low current or power saving?

Here is a good link to address this question: http://handle.dtic.mil/100.2/ADA421744 The paper is titled: "Space Vector Methods for AC Drives to Achieve High Efficiency and Superior Waveform Quality"

Are Inductor and Capacitor impedance in phase when a resonance frequency is reached?

Not at all..bcoz den da phenomenon of resonance itself will not occur..Look,resonance occurs wen inductive and capacitive reactance cancel out each other,i.e. the magnitudes of inductive and capacitive reactances are equal but they are 180deg out of phase with one other. Under resonance:: jwL=1/jwC BY...Rahul