Why does the line of fire not ignite when it touches the concrete wall, but when it touches the meta

to non-insulators.

With semiconductors to look at concrete and metal structures in between. Concrete can also be used as a conductor along with metal. Because the water absorption of concrete is strong, but its water adsorption amount increases and decreases accordingly according to the surrounding temperature and humidity. Resistivity of water and metals.

Very different (specifically non-pure still water). Each type of water sampled differently depends on its pH.

Depending on the size, the resistivity or value is different, but the reinforcing bars in the concrete are almost always bundled and connected directly into the ground from the bottom up. If the live wire is in contact with the steel bar, it is equivalent to a direct short circuit to the ground. If the fire line is in contact with the concrete wall, unless the concrete wall is highly saturated, it can also produce a slight spark, which is also a short circuit to the ground.

Depending on the degree of dryness, if it is too dry, the concrete is an insulator.

The flow of electrons is what people often call electric current. The water flows downward. Electrons also flow from a high voltage to a low potential. The earth is always at zero potential. It is often said that the live wire, with a voltage above 220 volts, objectively exists a law of flow to any conductor with low potential.

The resistivity of the concrete of the wall is large, and the metal is a conductor, so when the fire wire touches the metal, sparks are generated. In fact, it is the manifestation of the thermal effect of electric current.

The moisture of the wall is not very high, and the conductivity is not very good!

Because the wall does not conduct electricity.

Metal, on the other hand, connects to the ground to form a loop.

If you touch a wet wall, it will ignite!

The phase wire collides with the ground wire'A short circuit is formed'Sparks appear.

The resistance between the wall and the neutral wire is large, and the resistance with the ground wire is small.

Actually, not usually (this is time migration work) unless your walls are damp and there is a possibility.

1. The ignition difficulty caused by carbon deposition in the car can be solved by cleaning the throttle, cleaning the carbon deposition in the inlet duct, and cleaning the fuel injector.

2. The ignition energy of the spark plug is weak, so change the spark plug!

3. The low pressure of the fuel road is insufficient, and the ignition is not molded and shouts that the car is a low pressure oil road in the establishment of oil pressure, and the second time it can catch fire.

4. If the battery is out of power, you only need to find a car or other batteries to take power.

5. Exhaust pipe blockage generally rarely occurs, unless it is a coincidence or someone plays a prank, but this situation is easier to investigate, just take a look.

6. If the mixture is too thick or too thin, spray the chemical clear to the throttle and hit the car, and the car is easy to get on and try it repeatedly.

7. The engine timing is wrong, but when some models of engines replace the generator belt, it may cause tooth jumping, resulting in no car.

The ignition switch does not ignite, unplug the live wire.

Single-phase electricity refers to a phase wire (live wire), a neutral wire, the live wire touching the neutral line is a "short circuit", (single-phase) the live wire and the live wire are the same phase wire, and the two wires touching together are in parallel, that is, these two wires are equal to a wire.

If it is a three-phase electricity, the phase is different, and the instantaneous voltage difference between the two live wires is very large.

How the live wire and the neutral line will be ignited on the street, indicating that the internal line is short-circuited or the component is broken down and short-circuited, and a direct wire cannot form a short-circuit current, so it's okay, but the metal part of the casing may leak.

Two sensors. Each of them is a signal three.

Discharge to the tip conductor, make a spark, there is a small distance between the two ends,