If there are two straight current-carrying wires close to each other. Suppose the current directions in two live straight wires are opposite, as shown in figure (a). Then, according to the characteristics of the magnetic fields generated by the straight live wires, circular magnetic fields are generated around the two wires, and the directions of the magnetic fields are opposite. The direction of the magnetic field is the same between the two wires.
It's like placing two magnets between two wires. Their N poles are opposite the N poles and their S poles are opposite the S poles. Since the magnetic poles of the same name repel each other, the two wires create a repulsive force. Similarly, if two wires carry currents in the same direction, as shown in figure (b), they will attract each other.
If a current-carrying wire is in a magnetic field, since the current-carrying wire also generates a magnetic field, theThe magnetic field generated by the current-carrying wire and the original magnetic field will interact, causing the current-carrying wire to move under the force.
Detailed information
Current is divided into alternating current and direct current
Alternating current: amplitude and direction change periodically. . Devices plugged into the wall in daily life use civil alternating current. Alternating current is widely used in family life and industrial production. The household voltage of 220 V and the general industrial voltage of 380 V are both dangerous voltages.
Direct current: The direction does not change over time. Removable external power supplies used every day provide direct current. Direct current is generally widely used in various small household appliances such as flashlights (dry batteries) and telephones.portable phones (lithium batteries). Dry batteries (1.5 V), lithium batteries, accumulators, etc. are called DC power supplies. Since the voltage of these power supplies will not exceed 24 V, they are safe power supplies.
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The iPad battery is bulging and has been pierced with a needle. Will it explode? when charging?
In the primary battery, electrons flow from the negative electrode to the positive electrode and current flows from the positive electrode to the negative electrode.
Electrons flow through the negative electrode of the primary battery to the positive electrode through the wire. On the positive electrode, the oxidant obtains electrons and a reduction reaction occurs. The primary battery converts chemical energy into electrical energy. chemical reactions.
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(2) Depending on the reactions that occurduct at both poles: the pole where the oxidation reaction occurs is extremely negative and the pole where the reduction reaction occurs is extremely positive;
(3) Depending on the direction of the electron flow or current: the direction of current is given by Positive → Negative, the direction of electron flow is from negative → positive
(4) According to; the direction of movement of ions in the solution: the direction in which anions move is extremely negative and the direction in which cations move is extremely positive.
Detailed information
Primary battery formation conditions:
(1) There are two metals with different activities (or a The species is a non-metallic element or a metal oxide) used as an electrode;/p>
(2) The electrode materials are all inserted into the electrolyte solution;
( 3) The two poles are connected to form an iron circuitmé;
(4 ) Internal conditions: capable of a spontaneous redox reaction.
The primary battery uses the different potentials of two electrodes to generate a potential difference, thereby causing the flow of electrons to generate current. It is a device that converts chemical energy into electrical energy. Since the reversibility of the redox reaction of various types of primary batteries is very poor, they cannot be reused after being discharged, so they are also called primary batteries.
A primary battery can only be discharged once. When all the chemicals in it have chemical effects, it can no longer provide electrical energy, nor can it store externally supplied electricity, so it cannot be used later. is completely discharged, because its electrochemical reaction is irreversible.
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Baidu Encyclopedia--Reaction of primary battery
Can voltage be regarded as a kind of thrust? And why I*R=U? Please explain from a micro perspective.
The original poster is truly a wonderful person. The battery is bulging and I have to prick it with a needle. Do you think the battery is a human being? If you walk a lot, you can tie a knot on your foot with a needle and everything will be fine in two days.
The battery will not work.
If the lithium battery swells, it is declared dead and there is no need to save it. If you prick it with a needle at this time, it means you are stabbing the belly of the whale which is bloated after being dead for several days.
Why is the battery swelling? Because there is electrolyte inside the lithium battery, its charge separates opposite ions. However, if sheis overcharged, the ions are separated and no ions are available. What should I do ? Simply electrolyze the water. Have you ever been to high school? What does water electrolysis produce? Hydrogen and oxygen, the battery swells.
You prick it with a needle and penetrate the battery plates, which is equivalent to shorting the positive and negative poles. The mixed gas of hydrogen and oxygen came out of this small hole. Just when the needle tip connected the positive and negative electrodes, sparks appeared.
Do you know the original poster? This time you used a month of luck. It's good.
You even have to recharge it, you wouldn't want to die like that!
You can say that. Generally, the U voltage we are talking about is actually short for voltage difference. So, what is voltage difference? For example, a lithium battery has a positive electrode and a negative electrode.gative. The positive electrode is filled with positive ions after a chemical reaction and the negative electrode is filled with negative ions. The positive ions and negative ions will form a stable electric field inside the battery. After the positive and negative electrodes are connected through an external circuit, the free electrons in the circuit will flow towards the positive ions of the positive electrode of the lithium battery, and at the same time, the negative electrode will also produce a repulsive force on free electrons. Opposites attract and people of the same sex repel each other. With the movement of free electrons, there is a movement of charge Q, therefore a current I is generated, I=Q/t. Due to the different materials of the components used in the circuit, free electrons driven by the same voltage move at different speeds, resulting in different current intensities. Therefore, in order to measure the conductivity ofe different components, there existsR=V/I. R is a characteristic of the component linked to material and temperature. So there is I*R=U. Hope this helps the original poster understand.