Why is there no negative pole in the power output of the computer?

There is a negative electrode, after all, it is a normal DC output circuit, and there is a positive electrode and a negative electrode.

I don't know how you get the power supply without a negative pole? On the one hand, there are many binding posts in the output circuit, and the positive and negative poles and auxiliary circuits of the output circuit are relatively complex. Test pen.

It should be difficult to detect, and if it is a voltage tester with a voltage display, the accuracy.

It's not really high. Normal multimeter.

If the detection method is correct, you can get more accurate results, and the gear is played to 20V, and the positive and negative poles must be inserted correctly.

The essence of the circuit is to understand some electrical phenomena. The real role of the circuit is to convert the electrical energy in the power supply into other forms of energy. Electrons move in the circuit to form an electric current, and the electrons pass through the various components, which actually brings the electrical energy in the power supply to the components.

Electrons don't actually disappear in the circuit, at most they are neutralized by the negatively charged electrons and the positively charged when the power is off. It is not electrically external, and the circuit is also non-externally electrically when working. But the movement of electrons produces various electrical phenomena, so we define the movement of electrons as an electric current.

Let's talk about charging. Charging is actually the conversion of electrical energy in the circuit into the chemical energy of the battery. During charging, electrons flow from the positive electrode through the battery and out from the negative electrode of the battery. Electrons don't actually accumulate in the battery. What electrons transfer to the battery is energy.

A complete circuit must have a path for the power supply to work, the current comes out of the positive pole of the power supply, that is, the electrons come out of the negative pole of the power supply, and finally flows back to the positive pole of the power supply, that is, the current flows back to the negative pole of the power supply. In this way, the energy in the power supply can be transferred to the components.

The output of the computer power supply is "ground" and various output terminals of different voltages such as +12V, +5V and -5V (their voltage values are the voltage of the output terminal to "ground").

And what we usually call a 6V battery, if the negative pole is regarded as "ground", then the voltage of the negative pole is 0, and the voltage of the positive pole is +6V.

Therefore, the "ground" of the computer power output can be regarded as the terminal after the negative pole of each group of "positive power supply" is uniformly connected, that is, the common "negative pole" of the positive power supply.

There must be a negative pole! It doesn't work without a negative electrode.

Hello, the power supply must have a negative pole But it is not marked, these belong to the professional, generally not used, I hope to help you.

There are two possibilities:

1. Power supply problem, the power supply is broken or its output is less than 5V. Please note that when some power supplies are no-loaded, 5V or 12V is not output according to the standard voltage, and the normal voltage output will only be normal when a certain load is added. The power consumption of these gates that you connect is too small, so the power supply does not have a normal output voltage.

2. There is a certain resistance value in the poor contact of the connected power supply line or interface, which leads to the low voltage input to the gate circuit.

The black line is the negative pole, and it is the common negative pole of multiple sets of outputs.

Hello, the power connector of the laptop is generally a three-pronged seat (live wire, neutral wire, ground wire), and the other end of the wire is connected to the AC power configurator, and then the AC power configurator is connected to the laptop for power supply. If you want to distinguish, look at the voltage (volts, Chinese mainland 220V) current (ampere, unit) of the notebook [back manual online query detailed parameters] to distinguish. The AC configurator plugs into the laptop's circular connector, and the specifications are the same. FYI.

Generally, the round DC power supply is "positive inside and negative outside", that is, the needle inside is the positive electrode, and the entire circular part on the outside is the negative electrode.

Just buy an HP-specific one.

There is no need to distinguish between positive and negative poles, just plug it in.

The inside of the hole is a positive stage, and the outside is a negative pole.

The negative electrode is black. The color of the positive electrode is different according to the voltage, yellow 12V, red 5V

+ is the positive pole - is the negative pole.

Needless to say, the tap in the center is the positive pole.

The outside is the negative electrode.

All laptop power adapters are defined by this definition.

。。Among the four wires, the red line is +5V, the yellow line is +12V, and the two black wires are common land wires.

Then, two red for positive, infrared, there is a camera that can be connected in parallel, it is very simple to be 12V negative black. 。

The red one is the positive 12V yellow one is the positive 5V, and the black one is the negative one

Your problem doesn't correspond to yours**,Desktop power supply with a little common sense knows that it is 220 AC,Your** is clearly the previous optical drive or hard disk power cord plug。

GND is used by electrical appliances to release the shell or residual current, and cannot be negative, and the principle is to direct the current of the high electrode to the low electrode, such as the earth.

Many GND lines are not connected, the principle is that it is only a bridging function, such as connecting the hard disk shell with the power supply or chassis shell, and then it is generally exported from the external GND of the chassis or power supply.

220V is alternating current, which is one of the three phases of electricity. The two-wire system is L (live wire) and N (neutral wire), and the three-wire system is one more ground wire.

The GND on the board you are talking about is not connected to the negative pole of 220V, because the negative pole of 220V is not ground at all, but one of L or N. So it's normal not to connect, to connect that there is a problem, GND directly and AC L or N, then directly and the grid short circuit, small will blow up the capacitor, burn the board, heavy will hurt people.

GND is grounded, the complete loop is just from positive to negative, ground is not a necessary component.

GND wire grounding.

The specifics are not explained. Look at the information yourself.

Be careful with electricity until you go to bed with lights out.

Beware of the fire candle Lights out and sleep - -

All black wires on the ATX power output are negative (ground).