Is resistance related to quality, and what is the effect of high resistance?

If the rated power of the bulb is less than the output power of the battery, then the bulb can't stand it, and there is an upper limit for people to eat. The light bulb is the same, so the role of the resistance is to protect the normal operation of the electrical appliance. It is impossible to do without it, only a substance with absolute zero degrees can have zero resistance, but absolute zero, now it can only be infinitely close, and it can not be reached It also has rated power, because the resistance will heat up when it works, if it is too hot, it will be bad to become liquid, and the general resistance is metal.

They all have a melting point. It works by sharing the power of other appliances.

Resistance r= *(l s), is the resistivity, different materials have different resistivity, for example, silver has the least resistivity, followed by copper. Other things are equal. The smaller the resistivity, the smaller its resistance, l is the length of the conductor, and the longer the length, the greater the resistance.

s is the cross-sectional area. The larger the s, the smaller the resistance, which has nothing to do with the mass, the difference in quality is only the difference in the density of the material, depending on what material, if the material is the same, the resistance is the same.

In the case of the same material, the larger the mass of the wire of the same length, the larger the volume, that is, the larger the cross-sectional area. We know that the resistance of a conductor is inversely proportional to the cross-section.

Good luck.

It doesn't matter, it's related to the length and thickness of the conductor.

Q=WL R=1 WRC, where Q is the quality factor, W is the power supply frequency when the circuit is resonant, L is the inductance, R is the resistance of the string, and C is the capacitance.

Quality factor. or Q factor is a dimensionless parameter in physics and engineering, which is a physical quantity that indicates the damping properties of the oscillator.

It can also be used to express the magnitude of the resonant frequency of the oscillator with respect to the bandwidth.

The blind Q factor indicates that the oscillator loses energy at a slower rate and the vibration can last for a longer period of time, such as a single pendulum.

When moving in air, it has a higher Q-factor, while in oil, it has a lower q-factor for a single pendulum. Oscillators with a high Q factor generally have less damping.

Characteristics of the figure of merit:

1. A system with a low Q factor (Q<) is an over-damping system. The overdamped system does not oscillate, and when it deviates from the equilibrium point of the steady-state output, it will return to the steady-state output asymptotically in an exponential attenuation manner. The impulse response is the sum of the exponential decay functions of two different velocities.

2. A system with a high Q factor (Q> is an under-damped system. The output of an underdamped system oscillates and its amplitude decays exponentially under the intake of a specific frequency of masking voiding. Systems with a Q-factor slightly higher than may oscillate once or twice.

If the Q-factor increases, the damping effect decreases.

3. The system with Q factor is a critical damping system. The critical damping system and the overdamping system will not be over-damped, nor will there be overshoot. The critical damping system and the underdamping system will have a rapid response to the step, and the critical damping can make the system have the fastest response under the condition of overshoot.

There are four situations: 1] When the voltage is constant, the resistance is larger, the current will be smaller, and the power will be smaller. 2] In a constant current power supply, the current is constant, the resistance increases, and the voltage obtained increases, and the power consumed by the resistance also increases. This is all determined by Ohm's law i=u:

In a circuit connected in parallel and then connected in series, the voltage increases when the resistance increases, the total current decreases, and the current and voltage of the resistor connected in parallel with it increases. After connecting these two in parallel, the resistor, voltage, and current in series become smaller. 4] In the oscillation circuit, the resistance becomes larger, and the oscillation period becomes longer.

There are many other signal circuits in which the resistance becomes more attenuating the signal, which increases the input and output impedance. The increased resistance in the sampling circuit will result in a larger signal strength. It also depends on the specific circuit.

The most basic and common is the first item.

What effect does the ohmic size of a resistor have on current and voltage?

Question from the frog at the bottom of the well, hello, what is the effect of the ohmic size of the resistance on the current and voltage? Answer, 1. (If the resistance is large, the voltage will be small), and vice versa (if the resistance is small, the voltage will be large). Second, the current is also (the resistance is large, the current is small) and vice versa (the resistance is small, the current is good).

According to the analysis of the void closure factors that affect the size of the resistance, what are the materials (resistivity), cross-sectional area, and length of the methods to change the size of the resistance. A higher level of consideration, there is also temperature.

Does the large resistance of the neutral line have any effect on the electric pressure?

The probability of resistor damage is relatively low, but occasionally it will be damaged, usually due to overload when the current is too large.

Burnout. Let's take a look at the common sense of resistors, as well as the frequent failures.

1. The basic knowledge of resistors is usually the most common electronic component is resistance, there are many resistors on various circuit boards, most of the circuit boards composed of discrete components are color-ring-resistors, and most of the circuit boards with high integration are chip resistors.

No matter what kind of resistance, it has a certain amount of power, and the current passing through it cannot exceed a certain limit, otherwise the resistance will be burned out due to the thermal effect of the current, and it will lose its effect and form a broken circuit.

The general law, color-ring-electric-resistant, the thicker the resistance, the greater the general power. For chip resistors, the wider the resistor, the greater the power. As long as the current does not exceed the specified value, the work is very stable, and the damage is relatively rare.

For LED bulbs and electric vehicle chargers, there is a large resistor inside, and the function of this resistor is the fuse resistor, which acts as a fuse.

role. In the event of a failure, this resistor often burns out, creating a break in the current, protecting the electronic components behind it from causing a larger failure. Therefore, different resistors have power ratings.

The rated current cannot be exceeded when used.

2. The damage of the resistor is too large, exceeding the rated power of the resistor, causing the resistor to burn out and break the circuit. The working environment is humid, and the pins of the resistor will sometimes rust, corrode, and break the circuit after a long time. A small number of resistors, after a long period of use, the resistance value error of the resistance will be too large, that is, the resistance value is not accurate, resulting in the instability of the circuit working state.

Therefore, the common faults of the resistor are overload burning, wet rusting, and excessive error.

To sum up, the resistor acts as a blocker of the current and generates heat during use.

In order to prevent overheating, the resistors have a rated power, and the rated power cannot be exceeded in use. In the case of excessive working current and humid working environment, the resistor may burn the open circuit or the pin rust to break the open circuit.

1. The range should be determined according to the measured resistance value, so that the pointer indicates in the middle of the scale mark, so that it is easy to observe.

2. After determining the range of the resistance range, the method is to adjust the zero by short-circuit the two meter pens (direct phase resistor touch), adjust the "zeroing" electrical appliance to make the pointer accurately point to the "0" of the scale mark, and then measure the resistance value of the resistor. In addition, it is also important to take care that the human hand does not touch the ends of the resistor or the metal part of the watch pen. Failure to do so will result in test errors.

The resistance value measured with a multimeter is close to the nominal value. It can be considered that basically the quality is good, if there is too much difference or no work at all, it is bad.

The accuracy of the resistance value The maximum allowable current Whether the change of the resistance value with temperature is obvious.

How good is the resistance? Does it mean that the resistance is strong and weak?