What is the relationship between the load voltage and the nature of the load for a given circuit? 5

When the load contains energy storage elements such as inductors and capacitors, the energy storage elements do not consume active power, but absorb and feedback energy, resulting in the phase difference between voltage and current.

The inductance is the storage of magnetic field energy, the energy is proportional to the current, when the voltage is added to the inductance, the inductor will produce a self-inductive potential to hinder the change of the current, the essence is the process of converting electrical energy into magnetic energy, the current can only increase gradually, so the current lags the voltage.

The capacitor is the energy of the stored electric field, and the voltage is proportional to the charge stored in the capacitor, so the voltage will not change abruptly, but can only rise gradually with the process of charge accumulation, that is, the voltage lag current.

These characteristics are intrinsic physical properties of inductance and capacitance, and this is the case in the objective world. Therefore:

There are three cases of the phase of voltage and current in AC circuits, when the load is purely resistive in nature, the voltage and current phases are the same; When the load is (or contains) inductive properties, the voltage phase leads the current; When the load is (or contains) a capacitive load.

, the voltage phase lag current, or in other words, the current phase ahead of the voltage, such as: asynchronous motors that are commonly used.

It's the emotional load.

It is used to compensate for the power factor of the grid.

The compensation capacitance is the capacitive load.

The energy storage element itself does not consume energy, but the current caused will consume energy on the road resistance, and it will also occupy the output power of the generator, so it is necessary to overcome it as much as possible, which is the reason why the power factor of the system must be improved, and the power factor is the representative of the power system.

Parameters for the proportion of active power.

The magnitude of the voltage is in accordance with Ohm's law, but the phase varies depending on the load characteristics

Resistiveness: The voltage and current are in phase.

Inductance: voltage phase lead current (90 degrees ahead in pure inductance) Capacitance: voltage phase hysteresis current (90 degrees lag in pure capacitance).

The relationship between the load voltage and the input voltage: the voltage and current of the load are proportional when the load resistance is constant, the current and resistance are inversely proportional when the voltage is constant, and the voltage and resistance are proportional when the current is constant.

In a bridge rectifier circuit, if a load resistor is connected, the output voltage is about twice the input voltage if there is no filter capacitor at the output terminal. If the output is terminated with a filter capacitor, the output voltage is about twice the input voltage.

The input voltage of a circuit or a device refers to the voltage supplied by or applied to the circuit or equipment by the outside world. The output voltage of a circuit or device refers to the voltage supplied to or applied to the outside world by the circuit or device.

Meaning. If the magnitude and direction of the voltage do not change with time, it is called a steady voltage or constant voltage, which is referred to as DC voltage, which is represented by the capital letter u. If the magnitude and direction of the voltage change over time, it is called a fluctuating voltage.

For circuit analysis, one of the most important voltage fluctuations is the sinusoidal alternating voltage, which changes periodically in magnitude and direction according to the sinusoidal law over time. The instantaneous value of the AC voltage is indicated by the lowercase letters u or u(t). The device that provides voltage in a circuit is a power supply.

The load of the circuit refers to the electrical appliances that are used in Jianyan, not the resistance of the electrical appliances, nor the power rent failure rate of the electrical appliances.

The more loads, the smaller the resistance, the greater the current, r=u warp i, the smaller the voltage invariant, the greater the current.

According to Ohm's law i = u r, i is the current, u is the voltage, and r is the resistance. Therefore, the size of the cherry blossom in the current cluster is related to the voltage ridge or pulse and resistance. And the higher the voltage, the greater the current; The lower the resistance, the greater the current.

Four external characteristic curves of a power supply:

The external characteristic curve is the relationship between the voltage at the power supply end and the load current, the unit of U V --- longitudinal axis voltage U is V (volts), and the transverse axis represents the unit of current i is A (amperes). The voltage at the power supply terminal U = us (electromotive force) - i · ro (voltage drop on the internal resistance ro), so the internal cavity resistance ro = (10-9) voltage drop divided by the current 2 amps = ohms.

The relationship between the load current (when changing) and the voltage at the power supply terminal, e.g., the regulated power supply has straight load characteristics (i.e., external characteristics); Generally, manual welding power supply has the load characteristics of steep drop; Hand-held filament gas shielded welding power supply with microliter load characteristics.

Power supply. It is a device that provides power to electronic devices, also known as a power supply device, which provides the electrical energy required by all the parts in the computer. Whether the power of the power supply, current and voltage are stable or not will directly affect the working performance and service life of the computer.

The computer power supply is a kind of enclosed independent component installed in the main chassis, its function is to replace the alternating current with 5V, -5V, +12V, -12V, + and other stable direct current through a switching power transformer, and use the system components such as the system version, floppy disk, hard disk drive and the return of the virtual adapter expansion card. Sideburn.

Summary. The relationship between the load on the line and the power supply is that the load needs to get power from the power supply to meet the energy required for its operation. The power supply provides electrical energy, and the load consumes electrical energy, so as to realize the conversion of electrical energy.

There is only one load on the line, and the relationship between the load and the power supply.

The relationship between the load on the line and the power supply is that the load needs to receive power from the power supply to meet the energy required for its operation. The power supply provides electrical energy, and the load stove consumes electrical energy, so as to realize the conversion of electric reputation and energy distribution.

In addition, a circuit has only one load, and the relationship between the load and the power supply is that the power supply is the load energy, the load consumes the power supply energy, and the power supply drives the load to operate, and the load converts the power supply energy into mechanical energy or the energy output in the form of radiation energy, so as to realize the utilization of power supply energy. In addition, the load will also feed back to the power supply with a certain voltage bumping, current and power, as well as different circuit parameters, thus affecting the working state of the power supply.

I know this, I just want to ask, there is only one load of the circuit, the load side voltage is not the same as the supply voltage.

In a circuit with only one load, there is a resistive voltage drop between the supply voltage and the load voltage, so the voltage of the load side is generally less than the power supply voltage. In addition, if the load current is large, the voltage at the load end may be smaller than the power supply voltage, and there may even be a liquid shortage in the reverse phase situation, that is, the load side voltage is greater than the power supply voltage.

Summary. Answer: A circuit has only one load, the relationship between the load and the power supply is that the power supply provides the load energy, the load consumes the power supply energy, the power supply drives the load to operate, and the load converts the power supply energy into mechanical energy or radiation energy and other forms of energy output, so as to realize the utilization of power supply energy.

In addition, the load will also feed back a certain voltage, current and power to the power supply, as well as different circuit parameters, thus affecting the working state of the power supply.

There is only one load on the line, and the relationship between the load and the power supply.

Answer: A circuit has only one load, the relationship between the load and the power supply is that the power supply provides the load energy, the load consumes the power supply energy crackage, the power supply drives the load to operate, and the load converts the power supply energy into mechanical energy or radiation energy and other forms of energy output, so as to realize the utilization of power supply energy. In addition, the load will also feed back a certain voltage, current and power to the power supply, as well as different circuit parameters, thus affecting the working state of the power supply.

Hello, I would like to inquire whether the voltage at the load end is equivalent to the power supply voltage in an ideal state, regardless of the wire resistance, and there is only one load for the circuit.

Yes, in an ideal state, there is only one load of the circuit, regardless of the wire resistance, and the load-side voltage is equal to the supply voltage.

The relationship between line voltage and phase voltage, line current and phase current of a three-phase power supply is all related to the connection method. The same is true for three-phase loads.

When the resistance of the load RFZ is changed, the current also changes, but the total electromotive force E of the power supply does not change, so the output voltage, i.e., the terminal voltage U, of course, decreases. If the road-end voltage U is expected to remain constant, then the internal resistance r of the power supply must be zero, and the power supply becomes a constant voltage source, and the volt-ampere characteristic curve is parallel to the current line, that is, the horizontal dashed line in the figure.