Under what circumstances will it not be broken down by the current unless an industrial resistor is

Under normal circumstances, unless it is used in industrial electronics, this will not be broken down by the current, so if it is two movie capacitors, then it may be squeezed out, and then it will become hot.

If this happens, it is likely to be caused by a short circuit, and normally I recommend that you fix it, only then can you achieve a good effect.

It will not be broken down by electric current.

But either it's getting hot, and your sentence doesn't make sense.

It's because the current is too big instantly, so it will be broken down or hot.

If it is big enough, it is not easy to be broken down, and then the consequence of not breaking down is that it is hot, because the current is too large, and it has not been broken, so it hurts.

In general, unless you use industrial electronics, you will not be perming your hair with electric current or poop, so there are some qualitative and normal safety questions.

When the current in the l-coil is less than 15mA, the total resistance of the working circuit r total = .

In what case it will not be calculated by the current unless it is an industrial type of electronics, if it is responsible, that is, some facilities or methods that include some aspects of his work type.

Normally, it's just those things like water and electricity that fall down.

What type of resistor will not be struck by the current unless the industrial resistor is used?

Under certain circumstances, unless an industrial resistor is used, it will not be broken down by the current.

The resistor is a component that only plays the role of converting electrical energy into internal energy.

Putting aside the current and voltage, now given the power of the component (pure resistive element), then it can be seen that the heat generated by the component per unit time, the greater the power, the more heat is generated.

The relation given by the fact that an electric current is heated by passing through a resistor is Joule's law q=i 2rt.

I feel that the causal relationship between voltage and current in your narrative is not clear, but that there is voltage and then current, accompanied by the generation of heat.

The heat emitted through the resistors is not necessarily wasted and may be boiled.

Higher resistance can act as a hindrance to the current.

You have not figured out the relationship between resistance, current and voltage, in the case of a certain voltage, the smaller the load resistance, the greater the current, and the greater the power, because p=u 2 r, as for what the resistance converts into electrical energy, it depends on what the load is, if it is a resistance wire for heating, it is converted into heat energy, if it is a large part of the bulb converted into light energy, and a part is converted into heat energy.

You'll understand it if you learn a little bit later:

1. Pure resistance electrical appliances convert all electrical energy into internal energy, that is, heat generation. For example: electric heaters, electric kettles, electric blankets and other electric heaters.

2. For impure resistance, a small amount of electrical energy is converted into internal energy, and it is also converted into other forms of energy. For example, an electric fan converts electrical energy mainly into mechanical energy, and a small amount into internal energy to generate heat.

When charging the battery, the electrical energy is mainly converted into chemical energy, and a small amount of heat is generated.

When a TV is working, it has a picture (light energy), sound (mechanical energy), and heat (internal energy).

3. Current passingAny conductorThe internal energy generated, all followedJoule's Law:

The heat generated by a conductor is proportional to the square of the current in the conductor, proportional to the resistance, and proportional to the time of energizing.

Formula: Q=i rt

Fourth, Ohm's law hasRestrictive,For non-purely resistive circuits, Ohm's law does not hold.

For purely resistive circuits, the formula r=u p can be used

Calculate the resistance. For example: a 100W incandescent lamp for home use works at 220V voltage with a resistance of 484; The resistance of the 1000w electric kettle is.

Electric heater (electric kettle).

Ohm's law discusses the relationship between voltage, current, and resistance. It has nothing to do with the current flowing through the resistor to generate heat or work.

Discuss the relationship between resistance and current for heat or work Voltage, current, resistance and power p=ui or p=u 2 r or p=i 2r .

Under the premise that the voltage is the same, the magnitude of the resistance can limit the magnitude of the current in the loop, and the current flowing through the resistor also generates heat on the resistor, which consumes electricity, and the power consumed is the square of the current multiplied by the resistance value.

You say that a 220W appliance, 220 voltage, you need a resistance of 100 ohms.

This statement is false.

The resistance will not be broken down, only the possibility of burning out to form an open circuit.

What kind of circuit do you have that will break down the resistor? It's possible to burn it, it's not a diode, how much current is in the circuit, how much resistance do you want to use?

These words posted by the landlord show that the level of electrical knowledge may not reach the level of adding any resistance to the circuit. It is not recommended that you consider these now.

If you really need to do it, let everyone know the details so that you can pay attention.

Which circuit, what it used to be, what do you want to do now, what purpose do you want to achieve, etc. The more detailed you are, the more likely you are to get the answer to be used.

If it is a signal sampling, you can calculate the resistance r you need according to the size of the signal voltage v and the output resistance r1 of the signal source output, and according to the input current i and input resistance r2 required at the input end of your acquisition device

r=v/i-r1-r2。

It is recommended to learn Ohm's law first.

When the reverse voltage at both ends of the diode increases to a certain value, the reverse current will increase sharply, and the diode will lose its unidirectional conductivity, which is called the breakdown of the diode.

When the diode is electrocuted, it loses its unidirectional conductivity. If the diode does not overheat due to electrical breakdown, the unidirectional conductivity is not necessarily permanently destroyed, and its performance can still be restored after the applied voltage is removed, otherwise the diode is damaged. Therefore, the reverse voltage applied to the diode should be avoided when using it.

early vacuum electron diodes; It is an electronic device that is capable of conducting electric current in one direction. Inside the semiconductor diode, there is a PN junction with two lead terminals, and this electronic device has the conductivity of unidirectional current in the direction of the applied voltage.

Generally speaking, a crystal diode is a p-n junction interface formed by the sintering of p-type semiconductors and n-type semiconductors. A space charge layer is formed on both sides of its interface, which constitutes a self-built electric field.

Types of diodes.

There are many types of diodes, which can be divided into germanium diodes (GE tubes) and silicon diodes (Si tubes) according to the semiconductor materials used. According to its different uses, it can be divided into detection diodes, rectifier diodes, voltage regulator diodes, switching diodes, etc. According to the die structure, it can be divided into point contact diode, surface contact diode and planar diode.

The main parameters of the diode.

1. Maximum reverse working voltage.

When the reverse voltage applied to both ends of the diode reaches a certain value, the tube will break down and lose the ability to conduct electricity unilaterally. In order to ensure safe use, the maximum reverse operating voltage value is specified. For example, the reverse withstand voltage of the IN4001 diode is 50V, and the reverse withstand voltage of the In4007 is 1000V.

2. Rated forward working current.

It refers to the maximum forward current value that is allowed to pass through the diode when it is in continuous operation for a long time. When the current passes through the tube, the die heats up, and when the temperature exceeds the allowable limit (about 140 for silicon tubes and about 90 for germanium tubes), the die will overheat and be damaged. Therefore, the diode should not exceed the rated forward working current value of the diode in use.

1. Methods of circuit analysis.

The following is the method of analyzing the problem of changes in voltage and current (or light and darkness of the bulb) in each part of a closed circuit due to changes in local resistance (or switching on and off).

a Procedural analysis: "Part Whole Part Part".

1) The change in total resistance is judged by the change in local resistance.

2) The change in the total current is judged by the judgment.

3) Judge the change of road-end voltage according to U=E IR.

4) The change of voltage and current of each part of the circuit is judged by Ohm's law and the law of series-parallel circuits.

The above analysis can be visually expressed as:

b Conclusive analysis.

In the process of dynamic analysis of closed circuits, the following two conclusions (1) and (2) are summarized, and it is convenient and fast to use these two conclusions for circuit analysis.

1) The increase of the resistance value of any resistance r will cause the decrease of the current i in the resistance and the increase of the voltage u at both ends of the resistor.

2) The increase of the resistance value of any resistance R will inevitably lead to the increase of the current I in the branch connected in parallel and the decrease of the resistance voltage U string in series with it.

c Extremum or end-value analysis.

When the resistance value of a resistor on the external circuit changes (often the resistance value of the rheostat changes), a certain quantity or several quantities in the circuit also change, and the maximum or minimum value may appear, and the change of these quantities will be determined after the maximum or minimum value is calculated. For example, the resistance on a circuit may have a maximum value, the current may have a minimum value, and the voltage may have a maximum value. In some cases, there is no non-monotonic change in a quantity in the range in question, in which case the end value of the range of change is the maximum or minimum value.

d Special value verification method.

Several special states are taken within the range of change of a certain quantity, and these states are used to calculate and compare them to determine the change of certain quantities.

2 Tips for circuit analysis.

1) When discussing the change of voltage (current) on a fixed value resistance, it can be analyzed by Ohm's law of part of the circuit, and when discussing the change of voltage (current) on the variable resistance r, it can no longer be analyzed by Ohm's law, because its resistance decreases (or increases), and the voltage at both ends also decreases (or increases), i is not easy to determine, at this time, the total current is equal to the analysis of part of the current.

2) In a closed circuit, if any resistance increases (or decreases), the total resistance of the circuit will increase (or decrease), and if any resistance increases (or decreases), the voltage at both ends of the resistance will increase (or decrease), and the current through the resistance decreases (or increases).

When the voltage and current change, the resistance does not change, but the resistance changes when the temperature changes.

The resistance varies with temperature.

According to the regulations, the contact resistance of switchgear should be tested at a current greater than or equal to 100A, mainly to eliminate the error of the measured value of contact resistance caused by burr contact, not to say that the contact resistance will break down. In practice, the contact resistance of many switches has been compared, and the difference between using a double-arm bridge (measuring current of about 1A) and using a 100A contact resistance tester is not very obvious, that is to say, this kind of "breakdown" phenomenon is rare in practice.

According to you, if the rated power of the resistor is less than 150*150*, then there is a possibility of breakdown.

Why do you need electricity for electroless nickel plating? Electroless plating is not the same as electroplating.

Capacitance refers to the phenomenon that electric potential is concentrated in an area of a circuit, the capacitor is a path to AC and an open circuit to DC, and can store excessive current for delayed release, and these functions will be used in circuit design one or more. The earliest manufactured capacitor is two parallel metal plates, using the air layer in the middle to block the current, but the breakdown voltage of the air itself is too low, and later in order to save space and improve the capacitance, the insulating material will be used to evenly divide the two conductor materials, and then fold into a small piece, the insulation material between the two pieces of staggered conductors is broken down by the current is called the capacitor breakdown, usually due to the current above the design capacity, and some capacitors themselves rely on the breakdown to protect other circuit components. After breakdown, the resistance between the conductors of the capacitor decreases, and the original electric potential cannot be accumulated, so it loses its effect, and is basically equivalent to a conductor.

It's easy to see if it's broken, and it's good to replace the capacitor.

The high-voltage withstand voltage test is a voltage breakdown. No breakdown according to the specified voltage is qualified, and breakdown is unqualified. The current is all tested for current protection and quick break.

The high-voltage breakdown test is not a high-pressure withstand voltage test, but an intermediate link that must be tested for some products; For example, capacitor paper, battery plates, etc., to do a high-voltage breakdown test, it allows a certain range of a certain voltage can have several breakdown points, more than unqualified, not more than qualified;