Electronics Engineering

A multistage amplifier is composed of several single stage amplifiers.

Peak - neutral for 120 volts RMS is 169 volts, or 120 * sqrt(2)

Peak to peak will be 2 x this value, or 339 volts.

It is series circuit

Two ways to connect an ammeter, You can use a direct reading type, by connecting the ammeter in series with the load. You can use a current transformer type or CT. The current transformer looks like a wire wrapped donut with two terminals on its side with a hole through the middle. you pass the wire carrying the load through the center. Connect the direct reading meter to the two terminals. A CT type meter allows you to measure higher currents.

The power factor is a measure of the phase difference. If they are exactly in phase the PF = 1. If they are 180 degrees out of phase PF = 0.

Indeed yes. The magnetic core material does have some energy losses associated with its operation. These are known as hysteresis losses, and show up as the magnetic device (transformer, solenoid) becoming warm.

A transformer itself, merely reflects to its primary winding the conditions of the secondary winding. Their resistive losses, their phase change and so on.

This is copied from a similar question to yours fyi.

Using boron, phosphorus, and silicon as examples.

P-type doping is a process where a silicon atom in the lattice is replaced by a boron atom. A Boron atom has 3 electrons in the outer shell, compared with an electron occupancy of 4 for a silicon atom. So a Boron atom provides a vacancy for any free electrons to occupy with a little effort, when an electron chances to be nearby (the four boron-silicon covalent bonds needs 8 electrons to be stable, but only 7 are provided). The net charge of the material is still zero. More about from where the free electron is coming.

N-type doping is using a phosphorus atom to replace a silicon atom. A phosphorus atom has 5 electrons in the outer shell. So a phosphorus atom provides an electron that can be freed with a little effort (the four phosphorus-silicon covalent bonds only need 8 electrons to be stable, each atom needing only to contribute four electrons; the 9th electron will be loosely bound). The net charge of the material is still zero. Where can the electron go?

Magic happens when p-type silicon is brought in contact with n-type silicon to form a pn junction. The excess electron vacancies (holes) in p-Si now can exchange with the excess electrons in n-Si, but the net charge of the p-n silicon entity is still zero. However, microscopically, a depletion region is formed at the pn junction, where excess carriers can cross over to the other side. In the p-Si, excess electrons from the n-Si start filling up the holes (the lack of the 8th outer-shell electron to form the four stable boron-silicon covalent bonds) and negatively-charged boron atoms are formed. In the n-Si, excess holes from the p-Si start swallowing up the loosely-bound electrons (the 9th electron in the outer shell) of phosphorus atoms and positively-charged phosphorus atoms are formed. Once formed, and in the absence of an electric field, the depletion region now presents an energy barrier to any further carrier movement and a steady state results -- no net current in the pn junction.

An insulator is a material that prevents the passage of electricity. An example is the plastic insulating cover on electrical wires,

A conductor is a material that allows electricity to flow. An example is the copper wire used inside electrical cables.

a transformer require AC to function as desired it transform the AC to different levels. DC on a transformer can only see the actual primary or secondary resistance if the source is not limited in current it will burn the transformer by excessive heating since it will see only wire resistance.

Answer 2

the application of an AC voltage, V on one winding of the transformer produces alternating flux that links the entire core of the transformer. The changing flux induces an emf, E that opposes the main voltage. the current through the winding in this case is {(V-E)/R}; R= winding resistance

in case of application of DC, since there is no changing flux, there is no induced emf and hence the current will be V/R

since the resistance of the winding is very small, the current is very high and this can burn away the windings. hence DC is not used.

1Hz is unit of frequency,which is equals to one cycle per second........................

....................................................................................................shashi

not a clue

a

A: It all depends on the thyristor. There are no calculation involved not until you look up the thyristor specifications and decide on the load of the thyristor then you may calculate or more likely choose.

Yes. The force attracts the conductor to the magnetic field,

F= eVB = e(-V.B + VxB) = e[-V.B, ] =- eV.B when V and B are parallel!

leakage current can be determine through the use of clampmeter or ohm-meter. leakage current can be determine through the use of clampmeter or ohm-meter.

You can use Ohm's law (E=IR) to get this answer. Disconnect power to the circuit, and measure the leakage path's resistance (This is usually the rated resistance of the insulating material...you will need a M-ohmmeter to measure insulation resistance, as it will be MUCH higher than a standard ohmmeter can measure). Then rework the formula to solve for current: I=E/R or simply: divide voltage by resistance. You can also use an inductive current clamp as mentioned above. This clamp measures electrical current by measuring the electromagnetic field strength of the current flowing through the wire.

geyser eletronic circuit

A television set is a complex group of circuits where we find components in series and others that are in parallel.

Four 9v batteries connected in a parallel will still emit 9 volts because you are not increasing the voltage, you are increasing the life. To increase the voltage of four 9v batteries, you must connect them in a series; that series will emit 9v X 4(batteries), which equals 36 volts.

• The RELAY CIRCUIT used in electronics circuits for ,
• 1. It is used for general mechanical SWITCH.
• 2. It is used in High voltage switching mechanisms
  
• 3. It is used in High voltage and current Applications.

Material Engineers bring valuable expertise in materials from mining to recycling. The job of a Material engineer is to produce, design and evaluate materials and their use.

Input impedance (Zin) is assumed to be infinite to prevent any current flowing from the source supply into the amplifiers input circuitry. Infinite Input impedance is one of the Ideal Characteristics of the Op-Amp. With an assumption of Infinite Input impedance, there is no Loading on the preceeding stage to the Op-Amp (i.e. Supply.) or The Op-Amp under test does not draw any current from the I/p Supply to it's internal Circuitry.

China is, or used to be (the current material may be some made made material) china on power lines. The separators were made of china to insulate them.

Any gap anywhere in a series circuit prevents current flow in the circuit. That means that if a single

light in a series string burns out, they all go out. In order to determine which one failed, you have to

either inspect each little bulb with a magnifier and try to see which filament is gone, or else replace

one bulb at a time in the string until they all light up again.