What is tube pressure drop ? What does pressure drop mean A brief introduction to pressure drop

The tube voltage drop of the diode is still a resistance in its essence, but the resistance is very small when it is on, and it is close to infinity when it is not on, and the resistance when it is on will share a certain voltage, so it is called the tube voltage drop.

The voltage drop of the diode is that the diode will not turn on below this voltage, and will turn on above this voltage. The forward voltage drop of the diode at a specified forward current.

The forward lowest voltage that enables the diode to be turned on, the forward voltage drop of the low-current silicon diode is at a moderate current level, about V; Germanium diodes are about v. The forward voltage drop of high-power silicon diodes often reaches 1V.

The tube pressure drop of the diode: the forward tube pressure drop of the silicon diode (non-light-emitting type), the forward tube pressure drop of the germanium tube is, and the forward tube pressure drop of the light-emitting diode will be different with different light emitting colors.

There are three main colors, and the specific voltage drop reference values are as follows: the voltage drop of the red LED is, the voltage drop of the yellow LED is, and the voltage drop of the green LED is, and the rated current is about 20mA when emitting light normally.

The tube pressure drop is the voltage across the tube during normal operation.

The threshold voltage is when the voltage value at both ends exceeds this voltage, the tube is turned on, and after the conduction, the voltage drop at both ends of the tube will be reduced to a very small value, and it will no longer be the threshold voltage value.

What's going on with the diode voltage drop? One minute.

1. The pressure drop is the change of energy.

2. It is caused by the collision and exchange of momentum between the fluid particles during the overcoming of internal friction and the turbulence during the turbulence of the fluid flow, which is manifested in the pressure lifting force difference between the front and rear parts of the fluid flow, that is, the pressure drop. The magnitude of the pressure drop varies with the flow velocity in the tube.

3. The current flows through the load.

The subsequent change in potential (potential) relative to the same reference point is called the voltage drop, or voltage drop for short. The voltage drop is the driving force behind the flow of current. If there is no voltage drop, there is no flow of current.

When the collector junction is in forward bias, the transistor works in a saturated state, and this saturation state value is the current saturation, because when the collector junction is in forward bias, the voltage drop of the tube is also the voltage drop when he is on.

The tube voltage drop is understood as the voltage at both ends as the current passes through. The change in potential (potential) after the current flows through the load relative to the same reference point is called the voltage drop, or voltage drop for short.

The potential difference (potential difference) between the two ends of the load can be considered to be the voltage drop. The voltage drop is the driving force behind the flow of current. If there is no voltage drop, there is no flow of current.

For example, if the potential difference between point A and 0 is 2 V, and the potential at point B is 8 V, then the voltage drop between A and B is -6 V, or the voltage drop at point A is 6 V.

At a specified forward current, the forward voltage drop of the diode is the lowest forward voltage that the diode can turn on.

The forward voltage drop of a low-current silicon diode is at a moderate current level, about V; Germanium diodes are about v. The forward voltage drop of high-power silicon diodes often reaches 1V.

More people understand the volt-ampere characteristics of the PN junction, that is, the voltage drop of the PN junction has a logarithmic relationship with the forward current, if it is 1mA and 10mA, then 100mA and 1000mA will probably correspond to and about.

In fact, the above relationship is only established under the small current, when the current is large, the voltage drop of the diode resistor component should be considered, in addition to the pn junction, the diode also has the bulk resistance of the semiconductor material, the resistance of the package binding wire and the resistance of the pin;

Due to the voltage division of the resistor, the diode voltage drop will also increase with the increase of current, and the voltage drop of these resistance components is obvious in the case of several hundred mA to several A, it can be considered that the voltage drop is mainly determined by the volt-ampere characteristics in the case of small currents, and the voltage drop is mainly determined by the bulk resistance in the case of large currents.

What is the on-saturation voltage drop of the transistor?

In fact, the tube voltage drop is the voltage difference between the two poles of the tube.

The tube voltage drop is understood as the voltage at both ends as the current passes through. The change in potential (potential) after the current flows through the load relative to the same reference point is called the voltage drop, or voltage drop for short. The potential difference (potential difference) between the two ends of the load can be considered to be the voltage drop.

The voltage drop is the driving force behind the flow of current. If there is no voltage drop, there is no flow of current.

The method of detecting the pressure drop of the compressor tube of the air conditioner is as follows: positive destruction.

1. Turn on the switch of the pressure gauge and connect the hoses to the maintenance valve joints on the air conditioner.

2. After connection, you can see that there are two rows of circular numbers on the dial, divided into red and blue, plus a pointer.

3. The red is the degree of high pressure, and the blue is the degree of low pressure, and the numbers generally said are low pressure.

4. When any air conditioner using Freon 22 is running in the state of refrigeration, the pressure at the ambient temperature of 25 degrees to 45 degrees should be reached.

5. The scale on the table is the pressure, and the exhaust pressure and inlet pressure of the compression width machine can be known through the pressure display. <>

1) Strength test: first rise to 30% strength test pressure, stabilize the pressure for 15min; then rise to 60% strength test pressure, stable pressure for 15min; During the stabilization period, the tube is inspected, and there is no abnormal phenomenon, and it rises to the strength test pressure. The test pressure is times the design pressure.

2) Tightness test: the pressure of the test stove is times the design pressure, the pressure stabilization time is 24h, the pipeline is not broken, and no leakage is qualified. During the test, the pressure boost should be slow, when it rises to 30% and 60% of the test pressure, the pressure boost should be suspended, the line inspection should be carried out, and the pressure boost can be continued only after there is no abnormal situation.

Fluid pressure drop. The pressure decreases due to the loss of energy as the fluid flows in the tube. This energy loss is caused by the collision and exchange of momentum between the fluid particles during the overcoming of internal friction and the turbulence of the fluid flow, which is manifested in the pressure difference between the front and back of the fluid flow, that is, the pressure drop.

The magnitude of the pressure drop varies with the flow velocity in the tube. in the air conditioning system.

The smoothness of the tube during operation, whether the connection is noisy, whether the shrinkage hole and throttling will also affect the pressure drop.

Refer to the above content: Encyclopedia - Pressure Drop.

It is an electron tube such as 2-transistor, 3-transist.

To put it simply, it is equal to the on-voltage of the tube, if a diode is connected in series in a circuit, if the current of this circuit passes through the sliding diode, the circuit is on. At this time, the voltage at both ends of the diode is its on-voltage, such as the empirical value.