Electronics Engineering

one note on Dc, and AC voltages? sure

A DC is a Direct current, which means more accuracy and power. The device using DC power will maintain its action for longer with more accuracy.

Whilst AC is commonly used for lights and other unimportant devices.

That's the first note i could come up with.

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DC is direct current which as the name implies, the electrons (of the current) flow in ONE direction.

AC is alternating current, which as the name implies, the current alternates and has a "useable/definable" frequency.

AC has no definite terminal (Positive or negative) as the direction of the current always changes. This frequent switching can be seen as a sine wave.

whoops i forgot the answer HA HA HA HA HA HA

The amplification factor Vout/Vin determines the voltage gain.

To contact with the remote persons

since the diode shows its characteristics in a non linearly it is called as nonlinear element

since the transistor shows its characteristics in a linear way it s called as linear element

Transistors are typically operated in their linear region (such as when used in amplifier circuits), or as switches (where you will in general ignore the nonlinearity of the transistor). Transistors are typically DC biased to operate in this linear region. Diodes are not biased in this way.

Strictly speaking, both are nonlinear devices, although transistors can be used in their linear operation region, while diodes are not.

You can think of it this way:

When the FM carrier is modulated, you know that "sidebands" appear in the frequency spectrum,

at frequencies both above and below the carrier frequency. These are new signals, with energy

being transmitted at each sideband frequency.

But the power out of the transmitting hardware hasn't changed. Unlike the case with AM, the

modulation process most likely takes place in a low-level stage of the transmitter, and the

modulator supplies no RF power.

Since new signal energy appears at new frequencies separated from the carrier frequency,

the energy has to come from somewhere. No RF energy is added in the transmitter, so the

sideband energy comes out of the carrier signal.

That's a very unscientific and un-mathematical way to look at it, but I don't think it's

essentially inaccurate.

Current is the amount of electrons flowing. An ammeter reads this value. Typically an ammeter will be placed in series to measure this flow; there are also "clamp on" ammeters that use a small CT. When placed around a wire, the power flowing in the wire will induce a current in the CT, allowing measuremnt without lifting wires.

Voltage is more formally and descriptively called electromotive force. It is an electromagnetic force which causes outer valence electrons in the atoms of an electrical conductor to be disclocated and move from one atom to an adjacent atom when the conductor is connected in a loop or electrical circuit. The common unit of electromotive force is the volt. An electrical source, either directly connected or magnetically coupled with the circuit, produces the electromotive force. A "voltage source" maintains a fairly constant voltage in a circuit when resistance and current varies. A "current source" maintains a fairly constant current when resistance and voltage varies.

A generator, is an inductive device that converts mechanical energy, usually delivered through a rotating power shaft, to electrical energy. A revolving magnetic field in a rotor induces voltage in stationary coils (stator). The rotor can be either an electromagnet or permanent magnets.

Batteries and fuel cells produce voltage by a chemical reaction in a special cell which produces an excess of electrons at one electrode incorporated in the cell, which becomes negative, and an absence of electrons at the other electrode, which is the positive pole.

A photovoltaic cell is a light sensitive device constructed of semiconductor materials that readily absorb photons and release electrons in response. Conductive plates on either side of the cell develop an excess of electrons at one plate and an absence of electrons at the other plate, with a resulting voltage across the plates.

Thermocouples consist of two dissimilar conductive materials that are joined together at a junction. If each side of the junction is at a different temperature, a voltage will occur across the two conductive ends of the thermocouple.

A; air conditioning works on the principle of gas compression and expansion which tends to remove water molecules from the air. Air cooler just provide air flow to distribute evenly the air and probably add water to the environment

Integrated circuits are not really a material, so nothing is made out of them. If you are wondering what THEY are made out of, then nobody will really be able to tell you, as there is more than one way to do it. (Silicon and Zinc oxide to name a couple)

A: Feedback is a signal fed back from the output like from collector to the base .

missile-borne and non-missile-borne "countermeasures" equipment as radar jamming devices, underwater countermeasures technology, beamriders, infrared homing systems

W = A x V. Watts = Amps x Volts. There is not a voltage stated to multiply the 6 amps with so an answer can not be given.

An oscilloscope does not measure time. It is used to plot signals which are displayed as a change of voltage against (or with reference to) a change in time. To do this, the scope has to have something inside it to generate a "time tick" or otherwise provide a time reference. We usually find that a crystal oscillator is doing that job.

AC supply means the supply voltage is alternating one. Supply has some particular frequency and magnitude.

e.g. usual power supply to domestic use

DC supply means the supply voltage (or current) is not alternating. It is fixed one. i.e. frequency is zero.

e.g. batteries

Cannot say as different batteries with the same voltage have different capacity (rated in Ampere Hours).

If you had instead asked "How long will it take 532 milliamps to drain a 350 Ampere Hour battery?" that would be much easier (657.89 hours).

LC are connected in parallel combination to short out signals too high or too low in frequency from getting to the load.

FYI:
Series LC circuits give minimum impedance at resonance, while parallel LC (“tank”) circuits give maximum impedance at their resonant frequency.

The LC circuit behaves as an electronic resonator, which are the key component in many applications. Oscillators Mixers Graphics tablets Filters Electronic article surveillance & Tuners

For example: a capacitor/inductor oscillator acts as the tuner for the radio.

The sine wave that matches that particular frequency will get amplified by the resonator, and all of the other frequencies will be ignored. In a radio, either the capacitor or the inductor in the resonator is adjustable. This is how you "tune in" different stations on the radio :)

In a nutshell: A series resonant circuit provides voltage magnification and a parallel resonant circuit provides current magnification.

That might be done if the resistor is in a restricted space where the air flow is limited.

You need heat sinks to keep the resistors from burning up. A long time ago, I used resistors "to specs", and they burned up in a week. So I used "10x specs", and they burned up in a month. Finally, I waterproofed the resisters and dumped them in a pail of water (a big heat sink) -- that worked. (Not to be recommended, however.)

Inductive charging (also known as "wireless charging") uses an electromagnetic field to transfer energy between two objects. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

Induction chargers typically use an induction coil to create an alternating electromagnetic field from within a charging base station, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery. The two induction coils in proximity combine to form an electrical transformer. Greater distances between sender and receiver coils can be achieved when the inductive charging system uses resonant inductive coupling.

No, but certain types of AC single phase motors need a "startup capacitor" to make sure they start turning in the right direction when power is applied.

Oscillators are connected externally with the microcontroller to provide high frequency signal to the oscillator circuit in the microcontroller. The oscillator circuit provides the clock signal to the micro controller. Usually "PIEZO CRYSTAL OSCILLATORS" are used in micro controllers.

Modulation is any of several means of encoding an information carrying signal onto a carrier of fixed frequency. The purpose is to allow the information to be transported long distances.