Electronics Engineering

Sometimes we have to send low frequency information, like the tone of the voice of someone talking on a telephone, over a specific channel that only permits a specific high frequency, such as radio frequencies (RF). So how do we do that? One simple, cost effective, and bandwidth efficient method is to change, or modulate, a known RF signal a certain way. Some common ways of modulating such a high frequency signal are Amplitude Modulation and Frequency Modulation. Each of these modulation techniques has its own advantages and disadvantages and are therefore more useful in certain applications.

Not sure of the question, but *electrons flow from cathode to plate in a CRT. A deflection coil guides the electron beam to various areas of the screen. Some CRTs use electrostatic deflection, where the beam is deflected by four grids that steer the beam.

Voltage series feedback amplifiers can suffer from reduced input impedance, which may affect signal source loading. They can also introduce phase shifts that may lead to stability issues. Conversely, voltage shunt feedback amplifiers can lead to increased output impedance, which may limit their effectiveness in driving loads. Additionally, both configurations can experience bandwidth limitations due to feedback network design.

I read this in a book that it's because all class files in Java are identified by a magic number which reads CAFEBABE in hexadecimal assembly. The software engineers that designed Java at Sun used to take a break in a nearby cafe during work hours where they checked out hot girls while sipping their coffee.

The purpose of an electrical panel board or electrical distribution panel is to supply individual circuits from the main distribution board. As the board is supplied with one circuit of high capacity , it needs to be broken down into smaller branch circuits. Breakers accomplish this obligation by plugging into the panels main bus-bars. The load side of the breaker then goes to the specific load. The size of the breaker is dependant upon the size of the load of that circuit. The conductor that feeds the load is dependant upon the size of the breaker feeding that load.

i think that the light bulb glows brighter

That function was traditionally implemented in the form of a mechanical device
known as a "switch".

The practice became so firmly embedded in the art and science of electricity
that the word became the generic term for any device that could perform
any similar function, so that now we have "switching transistors", integrated
"CMOS switches", and even central office telephone-circuit "switches".

Well, I'm not entirely sure, but if this helps, one end of the magnet is South (s) the other is north (n). The north attracts the south pole and the other way round. If north Poles or south) are put together they repel each other.

• The Role of modulation in signal transmission varies because of what type of signal should be modulated.Then how long it should be travel in air.All these points are considered, when we go before modulation.
• Suppose we are transmitting vedio signal means it should be only Amplitude Modulated signal.If we transmitting audio signal means it should be Frequency Modulated Signals.
• So the Role of the modulation is varies in signal transmission.

the THERMORECEPTOR responds to changes in the temperature

The total current in a circuit consisting of six operating 100 watt lamps connected in parallel to a 120 volt source is 5 amperes.

Since power is volts times amps, take 600 watts (100 times 6) and divide by 120 volts to get 5 amps.

yes

No. Semiconductor has negative temp coefficient, because increase in temp causes the increase in the k.e of the electrons bu t not in the no of electrons . these highly energised electronsel increase current, & in terms conductivity.

A dry contact is a contact that does not provide voltage. For instance, the push-to-talk switch of a microphone, which just closes a circuit without providing voltage.

A wet contact is a contact that will provide voltage when closed, like the switch on the wall that activates the 110 VAC outlet to turn a lamp on in a room.

/

+------o o---------(o)

|

+---------------------(o)

Dry contact

/

+------o o---------(o)

|

--+--

--- Wet contact

------

-+-

|

+---------------------(o)

No current flows through the battery.

There is a current through the external circuit. I = E/R = 9/10 = 0.9 amperes.

There is no true advantage of RC circuits over RL circuits, as they perform different functions. RC circuits contain resistors and capacitors, while RL circuits contain resistors and inductors.

An ammeter measures current by either being inserted in series with the load being measured or using a clamp-on device that induces a proportional current that the meter measures. Nothing should happen if you connect an ammeter across a voltage source unless it was very high voltage compared to the rating of the meter.

EMF is basically a term for voltage. Two rules that are often used in calculations are:

1) Kirchoff's Voltage Law, which states that the total voltage around a closed loop is zero. Alternately, the voltage provided by a battery (for example) is equal to the voltage drop accross one or more connected resistances.

2) Ohm's Law: V=IR (voltage = current x resistance).

For more details, and example, I would suggest consulting a high school (or first-semester college) book about electricity.

A load can be used to describe many kinds of things. Some examples of these things are, what a truck carries, the clothes put in the wash machine, or things you carry.

It's function is to perform integer and difference solutions to analog inputs. It has - and + inputs. By choosing capacitive or resistive feedback you can alter the signal as needed.

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An operational amplifier, often called an op-amp , is a DC-coupled high-gain electronic voltage amplifier with differential inputs and, usually, a single output.

Typically the output of the op-amp is controlled either by negative feedback, which largely determines the magnitude of its output voltage gain, or by positive feedback, which facilitates regenerative gain and oscillation. High input impedance at the input terminals and low output impedance are important typical characteristics.

Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices.

External components govern the circuit characteristics.

As well as an amplifier designed to respond to a difference in voltage at the two input terminals, another type is designed to respond to different currents at the inputs. This is the Norton op-amp.

Modern designs are electronically more rugged than earlier implementations and some can sustain direct short-circuits on their outputs without damage.

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An operational amplifier is a voltage amplifier that amplifies the differential voltage between a pair of input nodes. It is a DC-coupled high-gain electronic amplifier with differential inputs and usually a single output. One input is an inverting input and the other input is a non-inverting input.

Within limits, the output goes to whatever value is required in order to make the two inputs have the same value. This means there is usually a negative feedback circuit between output and the inverting input. For an ideal operational amplifier, also called an op amp, the amplification gain is infinite.

The main tools for soldering include a soldering iron, a stand for the soldering iron, and solder. You'd likely use other tools such as brushes, picks, heat sinks, solder wick, desoldering irons, etc.

The full wave rectifier is a means of converting alternating current (ac) into direct current (dc). It is done with either the use of 2 diodes coming off a center tapped transformer, or by using a bridge rectifier, which conists of 4 diodes ganged together in a certain configuration. As it's name implies, it converts both the positive going and the negative going parts of the sign wave into useable dc, and therefore is more efficient than a half wave rectifier, which only converts 1/2 of the complete sign wave into useable dc.