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.


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