There is a question about voltage that has been confusing

I'll answer them one by one:

You: "The electrons in the conductor move under the action of the electric field force, and the electric potential changes, but at this time its kinetic energy also increases, right?" ”

Me: "That's right. Under the action of the electron in the electric field, the potential energy of the electron is converted into kinetic energy. ”

You: "The increased kinetic energy in turn translates into radiation, temperature, and so on." So there's no noticeable change in the speed at which it's moving in a directional direction, and that's supposed to be right, right? ”

Me: "That's right. The kinetic energy of electrons is converted into other forms of energy on electrical devices. ”

You: "But here's the problem, when we think about circuits, we often say that when an electron (current) passes through a certain electrical appliance, the electric potential changes significantly,"

Me: "That's right. Under the action of the electron in the electric field, the potential energy of the electron is converted into kinetic energy, so the potential energy of the electron decreases, i.e., it changes. ”

You: "The electric potential here is actually only talking about potential energy, and does not take into account that the kinetic energy of the electron actually changes, but is lost in other ways in the process. ”

Me: "It's the change (decrease) of potential energy that causes the change (increase) of kinetic energy." So when it comes to the change of potential energy, it means the change of kinetic energy, this process is a bit of a loss, but not all the potential energy becomes a loss, potential energy = kinetic energy + loss in the process of change, that is, conservation of energy.

You: "So, is it true that when an electron electric current travels and passes by an electrical appliance, the electric potential changes?" ”

Me: "The electric potential changes first, then there is the kinetic energy of the electrons, and then the electrons pass through the electrical device, and the kinetic energy is converted into other forms of energy. ”

You: "Isn't it supposed that the total energy of the electron current has changed, not just the potential energy?" ”

Me: "A change (decrease) in potential energy causes a change (increase) in kinetic energy." After that, the change (decrease) of kinetic energy causes a change (increase) in other forms of energy. ”

It's a question of electromotive force, current, equipotential.

The crux of the matter:

1. Without the presence of electromotive force, there is no current. On the contrary, as long as there is an electric current, you can know that there must be an electromotive force at work. This is the concept of equipotential.

2. There is an electromotive force (or potential difference) between two objects in contact, and there is not necessarily a current. It can be seen that the electromotive force is the external cause of the current generation, and whether the object can have an electric current depends on the nature of the object. That is, the nature of the object determines whether or not the current can flow.

3. The directional flow of electrons is the electric current. When no electric heat is applied to the outside of the object, the movement of electrons inside the object is also carried out all the time. It's just that the direction of electronic movement is disorganized. In this way, no trace of the current is visible externally.

Fourth, the essence of the so-called "law of the immortality of matter" is that "matter will not disappear for no reason, nor will it be produced for no reason". In electricity, it means that "after the work of electric charge, other physical phenomena will be generated, causing other physical phenomena (such as temperature changes, luminescence, electron radiation, etc.)." In other words, "the electric current is traveling, and when it passes through an appliance, the electric potential changes ,......."It is due to the directional motion of electrons that the object produces new physical variables.

At this time, we are not very concerned about the physical quantities caused by electrons, electric potentials, etc., but about how much work is done by these moving electrons.

Update 1:Will the battery voltage be equal to the load voltage?

It refers to the battery in a non-working state, that is, when the circuit has no current flowing through.

The potential difference between the positive and negative poles of the battery. In general.

When the li-ion is fully charged, the open-circuit vertical dispersion voltage is about the same.

After discharge, the opening pressure is left and right.

The open-circuit voltage through the battery.

It is possible to determine the state of charge of the battery. In solar panels there is an open circuit voltage, short circuit current, peak voltage, peak current, peak power.

If it were simple.

The open-circuit voltage refers to the voltage when the battery is not connected to the circuit, and it can also be regarded as a high electromotive force. Short-circuit current refers to the current when an electrical appliance is not in use.

It is equivalent to the current when you directly find a wire to connect the positive and positive couplings of the battery. Peak voltage, peak current, and peak power correspond to alternating current.

Direct current is the peak. Peak, as the name suggests, is the maximum.

For example, if we use a point 220, it is actually a valid value.

Then our peak usage should be 318. The closed-circuit voltage is the voltage of the battery when it is connected to a load.

Short-circuit voltage? I haven't heard of it.

Maybe it's a mistake.

It should be a short-circuit current. 2011-02-28 23:56:

28 Supplement: Of course, the voltage of the battery is the same as the voltage of the load Yu or Shi, if the voltage of the battery is in the open circuit, when there is a load, it is because there is a resistance inside the battery, so there will be a voltage drop phenomenon, of course, the load is.

1. This problem is the basic composition of the circuit, and it is necessary to be familiar with the drawing and connection of electrical components such as electrical appliances, ammeters, and voltmeters.

I don't need to talk about the basic composition of the circuit, the ammeter is to measure the current, and it needs to be connected in series in the circuit, which is equivalent to the current flowing through the ammeter.

Voltmeters are connected in parallel in a circuit and can be seen as measuring the potential difference between two points. Fully compliant with the definition of voltage. I hope you understand.

2. Judge which voltage the voltmeter is measuring, because the voltmeter is connected in parallel in the circuit, so when the voltmeter is connected in parallel with which part of the circuit (electrical appliances), then it measures which part of the voltage.

You can understand it this way: the internal resistance of the voltmeter is very large, so large that it is infinite, and grinding is only to open the circuit. You string the voltmeter into the circuit.

It is equivalent to opening the circuit, and the circuit will not work properly. If it is connected in parallel, it is equivalent to nothing being added and has no effect on the circuit. Therefore, the voltmeter can only be connected in parallel, not in series.

Of course, there is voltage in the power supply, and if there is none, it is not a power supply. If there is voltage alone, it is still not possible to form an electric ridge flow, and the positive and negative ends of it are connected with electrical appliances to form a path, so that the current will be generated under the effect of voltage difference.

Voltages are mostly connected in parallel in daily life.

Because each switch is separated in parallel, each switch controls the same pointer, so that if there is a broken electrical appliance, it will not affect other electrical appliances, and it can also be very clear that the electrical appliance is faulty, and if the liquid is connected in series, each electrical appliance will not be able to use the rated voltage, and the work will not be normal. Because the large electrical appliances at home are generally rated at 220V, the voltage from the power station to the home is generally 220V. There are also times when the total power is too large in series, causing disasters.

If there is no voltage in the power supply, it will not work. The wire is resistive, and when the voltage passes through the wire, the voltage drops on it and forms an electric current

The answer is c

Because the voltage reading of L1 is 0, it means that the lamp has been turned on, and like the wire, there is no resistance, that is, a short circuit.

The voltmeter connection method is to connect the two wires of the voltmeter to the two ends of the load respectively, that is, to connect the voltmeter in parallel with the load.

It's a series circuit...The current passes through L1 first...So it's c

L1 short circuit, the voltmeter measures the voltage of the short distance wire, the voltage is very small, the voltmeter shows 0; The voltage does not change, the resistance is small, the ammeter shows that it is large, L2 is overvoltage (or other more reasons), it is burned, and the ammeter has no indication.

I didn't see the drawings, so let me guess! The voltmeter is not connected to both ends of L1! Its process is that L1 short-circuit burns out L2, at this time the voltmeter reads zero, if it is L2 short-circuit voltage will not be zero, but will become higher (electric wishing voltage)!

The voltage of dry cell batteries and batteries is formed by the accumulation of positive and negative electrons at both ends of the positive and negative electrodes by chemical principles. The diagram below is a schematic diagram of household power supply, a loop is formed between the line of fire, the human body, and the earth, and the direction of the current is shown in the figure. The reason why the picture is drawn like this is easy to understand (it will be different).

Because the earth also has a resistance value, which is equivalent to a resistance (about 10k), then of course there is an electric current in the human body (although this current is not large, but it can also make people's arms feel uncomfortable), and people will be electrocuted. If the human body is in direct contact with the live wire and the neutral wire, it will be sucked on the wire, which will be life-threatening. In addition, the situation of hair standing up belongs to the category of generating static electricity, for example, the fur you hold and the glass rod will produce static electricity after rubbing, and the voltage is generated between the two objects, not between the ground and the object, so there is an electric current that flows between the fur and the glass rod, and the person is between the fur or the glass rod to the ground, of course, there will be no current flowing through the body, of course, there will be no electric shock.

If you can get a small piece of copper and a small piece of iron (zinc is better, but it's hard to find), then you must buy another apple, stick these two pieces of metal into the apple, and then use your tongue to add both pieces of metal at the same time (it must be sharpened, scratch your tongue and can't find me). You will find that your tongue has the feeling of being electrified! (Don't worry, your tongue won't catch fire, because when will you see an apple with dentures being electrified?)

The earliest batteries were made of copper sheets, zinc sheets and dilute hydrochloric acid. Later, the dry battery was better, the zinc carbon rod and the black mud inside. So dry cell batteries provide voltage through chemical reactions.

The chemical reaction causes electrons to flow out of the zinc skin, through the circuit from the carbon rod and back again.

Voltage, there is always a relationship between who presses whom, so as long as the voltage is mentioned, there must be two references, we are talking about the battery, that is, the positive and negative voltage of the battery, AC 220V, that is the voltage of the fire wire and the change, unfortunately between the fire wire and the earth is also 220V, so we people will be electrocuted if we touch the fire wire and the earth at the same time. If you stand on a wooden stand and touch the line of fire (at your own risk), I think the probability of you being electrocuted is zero unless someone else causes you to be electrocuted. If a bird stands on a high-voltage line and sticks its feet on the ground (if there is such a bird with long legs), it will also be electrocuted.

Because there are no such long legs, the birds we see are lucky to stand on the high-voltage line and not die. If I had a pair of wings, I would be smart enough to stand on the high line.

Current? That is, electrons (or positive charges) flow in something according to a certain pattern (because electrons in any object are not idle). Direct current (e.g. dry batteries) flows in one direction.

Alternating current, for example, the 1 degree we use, 5 cents, 5 is alternating current. The electrons in it go to the left and to the right for a while, so it is called alternating current. Direct current can electrocute people just as much as alternating current.

The electrons lose energy when they are affected by the resistance of the object in the process of flowing, so the light bulb glows and the electric stove heats up. Through us, we also get heated, (of course, the electricity is not the credit of the electrons, but the response of the human muscles to electricity), so the thief who steals the wire when the high-voltage electricity arrives is always black, as if it has been burned (in fact, it has been burned).

Charge, positive charge and negative charge. A proton has a positive charge of one unit and an electron has a negative charge of one unit.

Electrical energy is the work done by electric current. The higher the voltage, the greater the current and the greater the electrical energy.

Physics is wonderful. Your current interest is the stepping stone for you to learn physics well, study hard, and get to know the wonderful physical world around you, although you can't see many facts, but you can feel it with wisdom.

A capacitor generates an electric field, an inductor produces a magnetic field, and a current above the resistor generates a voltage.

There are 210V, as well as 230V or even 240V actual power distribution voltage, and the standard rated voltage of the socket is unified at 250V, which is more applicable and unified. In fact, because the socket basically does not have a transformer function, the voltage of its access is basically what the output voltage is, and it does not automatically output 250V.

The voltage of the electrical appliance is the actual voltage of its operation, and the average AC voltage of China's transmission and transformation is 220V, so the working voltage of the electrical appliance is 220V.

It should be noted that due to the fact that the transmission and transformation voltage of all countries in the world is not uniform, single-phase from 100V to 240V, in order to facilitate users, some travel appliances are designed to be from 100-240 wide adaptation voltage, which can be found from the identification of electrical appliances, such as laptops, more and more mobile phones, cameras, etc.

Question 3: Can the Xbox 360 Slim 4G Hong Kong version 220V be plugged into a 250V socket?

Answer: xbox360 is much more affordable than psp, congratulations, xbox360 slim 4g Hong Kong version: the voltage is China's conventional 220V, if you are unlucky, yours is the original Hong Kong version of 110V, you can't, you have to make.