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how it works computer power supply

Tuesday, 27 January 2015

We'll find out how laptop power provides work and what the power ratings mean.

In a notebook computer (PC), the facility provide is that the metal box typically found in a very corner of the case. the facility provide is visible from the rear of the many systems as a result of it contains the power-cord receptacle and also the cooling fan.

Power provides, typically remarked as "switching power supplies", use whipper technology to convert the AC input to lower DC voltages. the everyday voltages provided are:     3.3 volts, 5 volts,12 volts.









                                                       PC power supply

               
The 3.3- and 5-volts ar generally utilized by digital circuits, whereas the 12-volt is employed to run motors in disk drives and fans. the most specification of an influence provide is in watts. A watt is that the product of the voltage in volts and also the current in amperes or amps. If you've got been around PCs for several years, you almost certainly bear in mind that the initial PCs had massive red toggle switches that had a decent little bit of heft to them. after you turned the laptop on or off, you knew you were doing it. These switches truly controlled the flow of one hundred twenty V power to the facility provide.

­­Today you switch on the facility with a trifle electrical switch, and you switch off the machine with a menu possibility. These capabilities were other to straightforward power provides many years agone. The software system will send a sign to the facility provide to inform it to show off. The electrical switch sends a 5-volt signal to the facility provide to inform it once to show on. the facility provide additionally features a circuit that provides five volts, referred to as VSB for "standby voltage" even once it's formally "off", in order that the button can work. See future page to find out additional concerning whipper technology.

RESISTORS Basic MCQ Electronics- Electrical Components VIVA CSE - ETE-1

Saturday, 3 January 2015

Basic MCQ VIVA CSE - ETE- Electronics- Electrical Components-RESISTORS


1.A flow of electrons through materials- RESISTANCE

2.The presure that pushes electrons through a materials- VOLTAGE

3.A materials that has very high resistance to electron flow- INSULATOR

4.A materials that allows electrons to flow easily- CONDUCTORS

5.A materials that produces electrical friction and
restricts the flow of electrons- SEMICONDUCTORS

6.A resistor that is made by wrapping a wire around a ceramic rod- WIRE-WOUND

7.A resistor made by heating power and resin in an  oven-   THERMISTOR

8.A resistors made by depositing a very thin layer of resistive materials on
 a ceramic rod- CARBON FILM

9.One of the preferred values of a 5% resistor- 77 ohms

10.The amount of wattage a resistor can handle is determined by- SIZE.



Downloads Principle of Electronics Book

Sunday, 7 December 2014

Free Electrical And Electronics And Telecommunication Books Downloads
Downloads Principle of Electronics
By
V.K MEHTA
ROHIT MEHTA

S. CHAND Production










Downloads Click..

Happy Engineering.... :)

Electrical and Electronics Dictionary

Tuesday, 25 November 2014



 Electrical and Electronics Dictionary

Electric Network: The electrical components(resister,capacitor,inductor and supply sources) is connected in circuit in whatever i.e. series or parallel is called electrical network.

Complex Network:  It is those circuits which consists of many parameters (resister,capacitor etc) and these parameters are connected in such a manner that don’t solve easily by ohm law. When use ohm’s law for the solution of circuit so it’s required a lot of equation so we solve these circuits by different theorems. These circuits may be AC or DC.

Circuit: Circuit is a close conducting which allows current to pass or intending to pass pitch the circuit.

Open Circuit: Such circuits which not complete the path and its external resistance in infinite and zero current.

Short Circuit: Such circuit which provide shortest path to complete the circuit (before the load).  It’s resistance is zero and current is infinite.

Parameters  or Constant: The different element from which an electric  circuit are making is parameters or constant. i.e. resistance, inductance and capacitance.

Linear Circuit: Such circuit whose parameters do not change and remain constant with voltage or current is called linear circuit.

Non Linear Circuit: Such circuit whose parameters are change with voltage or current and do not remain constant is called non-linear circuit.

Unilateral Circuit: This is those circuit to which we apply the supply from only one side or they pass current from one side and from the other side they just behave like open circuit. i.e. diode, which is normally  used for rectification(conversion from AC to DC) process.

Bilateral Circuit: This is that type of circuit which pass the current from both side, OR they work in proper way when current is applied to it. i.e. transmission line etc.

Node: Appoint in a circuit which connect two or more than two circuit elements together is called node. OR Node is a point in a circuit from which current is distributed in two or more than two paths.

Branch: The path b/w two junctions is called branch.
A close path in a circuit which do not encounter any component more than one time.

Mesh: It is a component, which do not have any loop in it. OR Mesh is a loop, which has no loop within it.

LASER-'light amplification by stimulated emission of radiation

IMEI : International Mobile Station Equipment Identity (IMEI)

There are following parts of an IMEI:
*       -           Type Approval Code (TAC): 6 decimal places, centrally assigned.
*       -           Final Assembly Code (FAC): 6 decimal places, assigned by the manufacturer.
*       -           Serial Number (SNR): 6 decimal places, assigned by the manufacturer.
*       -           Spare (SP): 1 decimal place.
                         Thus, IMEI = TAC + FAC + SNR + SP

International Mobile Subscriber Identity ( IMSI):

Mobile Subscriber ISDN Number ( MSISDN)

Mobile Station Roaming Number ( MSRN):

Time division multiple access :(TDMA)

FDMA:Frequency-division multiple access

A private automatic branch exchange :PABX
 
Quadrature Phase Shift Keying :(QPSK)

                                                                 Electrical and Electronics Device Symbol

Alternating Currents (AC) Mcq Viva questions answers-1

Friday, 7 November 2014

Alternating Currents (AC) Mcq Viva interview Short questions answers

 1. The a.c. system is preferred to d.c. system because - a.c. voltage is easily changed in magnitude

2.  In a a.c. system, we generate sine wave from because - it produces least disturbance in electrical circuits.

3. Friction-will produce A.C. voltage.

4. Electroplating - will work only D.C. voltages.

5. In a D.C circuit we consider the resistances (R) only. But in an A.C circuit in addition to resistance (R), inductance (L), and capacitance (C).


                                                   figure: AC supply Input - Output

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