Things You May Want to Know About Power Supply,an Introduction to Power Supply

An Introduction to power supply

The Armenian Nuclear Power Plant (ANPP) (Armenian: Õ€Õ¡ÕµÕ¯Õ¡Õ¯Õ¡Õ¶ Õ¡Õ¿Õ¸Õ´Õ¡ÕµÕ«Õ¶ Õ§Õ¬Õ¥Õ¯Õ¿Ö€Õ¡Õ¯Õ¡ÕµÕ¡Õ¶), also known as the Metsamor Nuclear Power Plant, (Armenian: Õ„Õ¥Õ®Õ¡Õ´Õ¸Ö€Õ« Õ¡Õ¿Õ¸Õ´Õ¡ÕµÕ«Õ¶ Õ§Õ¬Õ¥Õ¯Õ¿Ö€Õ¡Õ¯Õ¡ÕµÕ¡Õ¶) is the only nuclear power plant in the South Caucasus, located 36 kilometers west of Yerevan in Armenia.

The ANPP complex consists of two VVER-440 Model V270 nuclear reactors, each capable of generating 407.5 megawatts (MW) of power, for a total of 815 MW.

The plant supplied approximately 40 percent of Armenia's electricity in 2015.

As with other early VVER-440 plants, and unlike Western pressurized water reactors (PWR), the ANPP lacks a secondary containment building.

The voltage may drop slightly as you add loads. In theory it should not change at all? of power supply

The Voltage drops slightly as you add loads (increase load current) because more Voltage is dropped across the internal resistance of the power supply. The Voltage that is dropped across the internal resistance of the power supply subtracts from the source EMF of the power supply leaving a lower Voltage at the output terminals of the power supply.

Not only will the Voltage drop slightly as you add loads it will also increase slightly as you remove loads.

In theory the internal resistance of a power supply is usually assumed to be zero. That is why in theory the Voltage does not change at all with variations in load current.

Voltage regulators can eliminate this problem within certain limitations.

Response to additional details:

It is necessary to understand that the internal resistance (Ri) of a power supply must be considered as a real resistor connected in series between the source EMF (Vs) of the power supply and the output terminals of the power supply. The Voltage at the output terminals of the power supply may be labeled (Vo)

The source EMF (Vs) can not be measured by conventional Voltmeters because there is no direct access to its terminals. The resistance value of Ri can not be measured with a conventional Ohmmeter for the same reason.

The equation for the Voltage drops around the series circuit would be as follows:

EMF- (I)(Ri) - (i)(RL)] = 0

Since Ri is internal to the power supply then the Voltage at the output terminals (Vo) of the power supply must be:

Vo = EMF - (i)(Ri)

From this it should be obvious that increasing load current (i) with both (Ri) and EMF constant would result in a reduction in (Vo).

Computer won't boot after a power outage of power supply

The best solution in cases like this since your equipment has no more warranty, is one of two: If you don´t really know what you are doing, DON´T DO IT, this makes things worst, so take it to a technician, or to a friend who can test and repair for you. The worst thing is trying to fix things that aren´t really damaged. If you know what you are doing, let´s go:The first thing is to open the computer and test essencial pieces, always being very careful with your equipment ( remember static electricity ).

01 - Begin by testing your power supply.

If the power supply is faulty, the rest won´t work at all.02 - If the power supply is good, you should test bios, motherboard and CPU. Make a bios reset, by taking out the battery and putting the jumper which control bios reset on the reset position, wait for about 30 seconds and then put it back.

03 - You could test the power supply in the other computer in order to see if it´s good, but beware ! If the power supply is faulty, it could damage your other computer, so, there´s a solution, that is locating the power supply wires which turns it on, so, you could turn on the power supply without a computer, and with a multimeter, testing the voltages. ( the contrary may work: If the power supply is not good, you could bring the other computer power supply and test on it ).04 - The most precious thing: You could and should check if your data on HD is intact, by putting the hard disc on other computer and see if it works.

It it works, you could use a software called Acronis True Image ( or similar ) and make an image of the whole disk just in case. With this image, you can transfer the content back to the HD or to a new HD ( if necessary, some power problems could cause HD failure, but many times we can retrieve the information ) without losing any data. This has helped me a lot. Even yesterday, I had a problem like yours that my windows 7 wouldn´t boot up, blue screen.

I simply put the Acronis True Image disk on the drive, booted up by it, located the image file on an external hard disk and restored the whole partition in 10 minutes. So, in 10 minutes, my PC was back on business with no problem. I highy recommend creating images of your boot disks from time to time.

HDs are very impredictable pieces.

Good luck.

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