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1) Definitions or Interpretations.
When the voltage and current change according to the sinusoidal law, the effect of the circuit with resistance, inductance, and capacitance on the alternating current is called impedance, and its value is equal to the ratio of the effective value of the voltage at both ends of the circuit to the effective value of the input current, that is, z=u i.
2) Units. The unit of impedance is ohms.
3) Description Due to the different connection methods of various components, the impedance formed is also different, as shown in the figure, in the series circuit, the relationship between resistance, inductance, capacitive and impedance can be represented by a right triangle (as shown in the figure). Since the inductor voltage is ahead of current phase 2, XL is ahead of R phase 2 (because R and current are in phase). Since the voltage of the capacitor lags behind the current phase 2, the xc lags behind the r phase 2.
Therefore we get z = root number [r2+(xl-xc)2]; From the diagram, it can be seen that (in the impedance triangle), the angle between the z side and the r side is the phase difference between the voltage and current in this section of the AC circuitWhen R, L, and C form a parallel circuit, the impedance calculation in the parallel circuit is more complicated, and the total current of the circuit is generally found first, and then the total impedance is obtained. The general calculation steps for the simplest parallel circuit are as follows:
a.Since the voltage at both ends of each parallel branch is the same, the current of each branch can be calculated using Ohm's law of alternating current.
b.The total current is calculated from the known current of each branch through the vector sum. Because the current of the inductor is behind the voltage phase, etc., and the current of the capacitor is the phase of the leading voltage, the current of the resistor circuit is taken as the reference (that is, the voltage and current are in phase for the pure resistor), then the current of the inductor and the capacitor will lag behind the phase of the resistance circuit by 90°.
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What is Resistance Voltage? I come, when the applied voltage u is 0, the current i is not 0. Only when the reverse voltage is applied, that is, the cathode is connected to the positive electrode of the power supply, and the anode is connected to the negative electrode of the power supply, and an electric field is formed at the two stages of the photocell to slow down the electrons, the current can be 0.
The reverse voltage UC that reduces the photocurrent to 0 is called the restraining voltage. The presence of a restraining voltage means that the photoelectrons have a certain initial velocity.
The relationship between the work done by the electric field force on the electrons in it and the energy is obtained: the maximum kinetic energy of the suppression voltage u and the photoelectron is ek=eu
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Extra-low voltage is the highest voltage that exists between two conductive parts that can be reached at the same time without danger to a person in the most adverse circumstances.
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The general safe voltage is 36 volts.
The safety voltage is generally referred to as a voltage of 36 volts or less. Because when a person is electrocuted, the current is the direct factor that causes the injury, and the larger the current, the more serious the injury. Experience has proved that if the current through the human body exceeds 50 milliampere, the electric shock injury will endanger people's lives, and it is not easy for the electrocuted person to get out of the power supply by himself.
The resistance of the human body is generally between 800 ohms and 10,000 ohms. Calculate the resistance of the human body at 800 ohms, and add 40 volts to the human body through a current of 50 milliamps. Therefore, in general, it is stipulated that the bright voltage of the electric trap below 36 volts is a safe voltage.
But it should be noted that the resistance of the human body drops dramatically in some cases. If the workplace is very humid or has corrosive gases; ** Sweat or splashed wet by conductive solution; There are conductive dust, etc. At this time, 36 volts is not a safe voltage, and the voltage applied to the human body is not more than 12 volts, so 12 volts is called an absolute safe voltage.
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Friend, the former poor family stipulated that the safety voltage was 36V, that is to say, the voltage higher than 36V is dangerous to life, so how many volts can the consumer resist at most - naturally 36V, the lesson of life and blood!!
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Normally, as long as the voltage is not higher than 36V, it is safe for the human body.
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According to the mains transformer, it can only be 36 volts at most.
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It can only resist 36V low voltage safety electricity.
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Clicking is due to the physiological reactions and changes of the internal organs caused by the passage of electric current through the human body. Depending on the magnitude of the electric current, the human body reacts differently. 1 is related to the current intensity, alternating current (AC) direct current (1mA) people's first reaction is to have electricity.
The maximum current that an alternating current (AC) 10mA and DC (DC) 20mA can tolerate and get rid of independently. AC currents greater than 50mA pass through the human body, and cardiac arrest and respiratory arrest may occur after more than 1 second. Different current frequencies have different degrees of harm to the human body, and the test proves that the damage of 28-300Hz AC current to the human body is relatively large, and the impact of the same value DC current on the human body is relatively small.
Therefore, the voltage of the electric baton is high, the frequency is high, the current is small, and it feels very powerful when it first comes into contact, so it's okay to really grasp it.
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lz good, here are the characteristics that can be broken.
Features that can be ignored.
Ignores ailments such as softness, dullness, sleeplessness, self-centeredness, lava armor, water cover, energy, immunity, etc., but after using the skill, these perks reactivate and the ailment is removed.
Ignores psychic power, green leaf guardian, and other characteristics that are immune to inflicting ailments.
Ignores weakened immunity levels such as Clean, Sharp Gaze, Strange Force, White Smoke, and Breastplate.
Ignores magic reflexes.
Ignore features that affect hit rate, such as Sand Cover, Snow Cover, Stagger, and Miracle**.
Ignores the perk of immunity skill damage and effects:
Strange Guardian, Floating, Electricity Storage, Water Storage, Ignition, Electric Engine, Herbivore, Dry Skin.
Scales, soundproof, suction cups, hard, sticky.
Lightning rods, water diversion.
Skill targets are not affected by lightning rods or water diversion.
Ignores defense-boosting traits such as mysterious scales and flower gifts.
Ignores damage reduction traits such as thick fat, heat resistance, filters, solid rock, teammate guards, and multiple scales.
Ignore teammates' extrasensory senses.
Ignores Combat Armor and Shell Armor.
Ignoring nature. The use of self-destructive, large ** ignores moisture characteristics.
Ignoring weight-bearing properties such as heavy metals and light metals when using weight bombs and thermal trampling.
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I saw on the official website that tesa 53988 insulating tape can resist 7000V and can be used for insulation protection of various motors and electronic components such as interior wiring, transformers, capacitors, voltage regulators, etc. For specific information, you can go to their official platform to see.
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The description of inductance is not accurate.
An inductor, when its current rises (or falls), it will produce resistance, resistance current "change".
So, an inductance that reacts infinitely to an inductance, when the current rises, it produces resistance, so the "amount of change" of the current is infinitesimally small. If the initial current of the inductor is 0, then the current "does not change", which means that the current remains at 0. When the current drops, the inductor also has to keep the current from dropping, so that the amount of change is 0, because it is 0 in the first place, and it remains unchanged and of course remains 0.
The relationship between voltage and current on an inductor is:
The integral of the applied voltage in time Inductance = current (so the inductor current cannot be abruptly changed, it must accumulate time to change).
Or the rate of change of the current x the amount of inductance = the terminal voltage (so the induced voltage is proportional to the "rate of change" of the current, but not to the magnitude of the current itself).
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An autotransformer can be understood like this:
The part of the output we call it the secondary, and it is also a part of the primary winding, which generates the primary current from the input voltage, and generates the main alternating flux in the magnetic loop, as the output, that part is the secondary winding, and the alternating flux generated by the output current is in the opposite direction to the primary flux, so the primary will increase the current and increase the flux to compensate for reaching the magnetic equilibrium.
The secondary stage, as part of the primary, together generates a self-induced electromotive force, which is opposed to the supply voltage and prevents the primary current from increasing.
The direction of the secondary current is opposite to that of the primary current, so a phenomenon occurs: the current ls that actually flows through that part of the coil in the secondary stage is the difference between the primary current
ls=i2 - l1
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Note that the primary and secondary stages of an autotransformer are a coil.
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The magnetic field generated by the secondary winding of the autotransformer is opposite to the magnetic field generated by the primary winding, so the self-induced electromotive force of the primary winding is reduced, so that the excitation current of the primary winding increases and maintains the original magnetic flux. The secondary electromotive force is generated by the magnetic field induction of the primary winding, so the voltage polarity is opposite to the primary.
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The smaller the molecule or dispersed particle, the higher the zeta potential (positive or negative) and the more stable the system, i.e., dissolved or dispersed to resist aggregation. Conversely, the lower the zeta potential (positive or negative), the more inclined it is to condense or condense, i.e., the attraction exceeds the repulsive force, and the dispersion is destroyed and condensation or condensation occurs.
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That's right, if the speed of light is too low, the reason is that when he sets it, it's relatively low, or it's him, and the machine is under relatively low conditions.
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What is the reason for the low use of potential reference light? His point is too low, which is caused by voltage voltage.
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The potential reference beam is too low, and it's probably a low value, because I think it's okay to make some adjustments.
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What is the reason why this potential beam is too low? Potential, just know that these words are photonic mechanics, electromechanics, electricity, you can go through that photon or something, just electricity.
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It may be due to some changes in temperature, and it is also due to some environmental influences.
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The reason why the positioning reference speed of light is too low is that its setting interface is too low.
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The reason why this potential refers to the speed of light is too low is that we don't have the time to show light.
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Advertising tariffs, he is the fourth reason for this reason, this is his monitor, obviously not too high, so it seems too low.
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I think we should measure the particle size first to see the size of the suspended particles inside, the size distribution, etc.;
After that, the zeta potential is measured.
Also, is the median unit of the LZ text MV? If so, it may indicate that the particles in the specimen are nearly electrically neutral
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The reference speed of light for this potential is too low, and there should be a special reason for this, which can be set.
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The positioning reference here, then you are moving at the speed of light, the speed is very strong, and its light is very bright.
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If he had been in the vegetable patch, it might have been a sign that the battery was running low.
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So what is the reason for you, it is very important for me to get it back, this is really.
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Movie. is a reference light. The tree is too low, what is the reason? Can you do this? Consult about the after-sales service, what can be the reason.
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If it's low, what do I feel? If it is found to be too low, it may be that his parameters are relatively small!
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Is it because you set it up wrong? Or maybe it's just the power supply, something else.
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Well, the reference beam is too low, which is from a physical point of view, and if the reference is too low, it may be because of the intensity of the beam.
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If the speed of light is too low, it may be because you have a problem with some of these settings, you can take a look.
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The reference speed of light is too low, this should be well, the power is insufficient, right?
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Under normal circumstances, if the reference speed of light is too low, then I suggest that you increase the attack speed, and the most important thing is to increase some light energy.
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If the TA potential reference level is too low, it may be a problem with your adjustment.
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Maybe his lack of pressure will lead to this situation, you can find the power supply bureau to repair it in time.
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What is the reason why the potential reference speed of light is too low? If you don't understand this, you can ask the electrician, because they are more professional and know more.
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What is the reason why the potential reference speed of light is too low, the reference company can ask professional personnel to overhaul it.
If you are willing to live 20, that is also your own choice, and if you live 80, it is your life...
In ancient times, people's living standards were not high, medicine was underdeveloped, and people's life expectancy was generally not high, so people's highest goal was to live 100 years old. Nowadays, people's living standards are high, the quality of life is gradually improving, medicine has also developed a lot, and there are many elderly people over 100 years old, and some people are up to more than 170 years old. Therefore, the upper limit of human life expectancy changes with the development of the times, and people can only live 100 years because of the limitations of that era, and modern people can not only live 100 years old.
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