Can you get a report on the identification and measurement of electrical components?

Question Answers: ABC Question Analysis: Analysis:

As can be seen from the circuit diagram, the voltmeter measures the voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and then judges according to the experimental principle in the option Answer: a. The voltmeter measures the voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and the bulb resistance is calculated according to Ohm's law, and the voltage at both ends of the bulb is changed by the sliding rheostat to obtain multiple sets of data to obtain the law, so the resistance of the small bulb can be measured, so it is in line with the topic; b. The voltmeter measures the voltage at both ends of the bulb, the ammeter measures the current through the bulb, and the electrical power of the small bulb can be obtained according to P=UI, and the actual power of the bulb under different voltages is measured by changing the voltage and current through the sliding rheostat, and the law is obtained by comparison, so the actual power of the small bulb can be measured, so it is in line with the topic; c. The voltmeter measures the rated voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and the rated power of the small bulb can be obtained according to P=UI, so it is in line with the topic; D. Determine the relationship between the current and voltage of the small bulb connected in series and parallel, the bulb needs to be connected in series and parallel, and the series and parallel connection can not be done at the same time, so it does not meet the meaning of the topic Therefore, the abc Comments: This question examines the analysis of the experimental circuit diagram, the key is to understand the principle of each experiment and the role of the circuit elements, it should be noted that this circuit diagram is only a part of the circuit, and it is analyzed and judged according to the knowledge and experimental principles accumulated in ordinary times

The landlord, I can send it to you, there are some of them.

You're good and happy to answer for you. There are two main reasons for the error of the basic measurement experiment of electricity:1

Component performance and parameter error: The theoretical value at the time of design is based on the ideal component, while the actual device cannot achieve the ideal performance and parameters. Just as you can't measure the size of Hongchun without error with a ruler.

2.Errors generated by measuring instruments: Errors will occur in the process of sampling and processing to display, especially for data sampling, and errors cannot be avoided at any high frequency of data sampling rates.

There are many other factors that cause errors, such as power supply internal resistance, line loss, etc.

1. Purpose of the experiment 1learn the correct selection of AC instruments and equipment; 2. Learn the method of measuring the parameters of AC circuit devices by the three-table method (voltammetry); 3. Master the use of power meters and voltage regulators; 4 Learn how to correct measurement errors caused by the internal resistance of the meter. 2. Experimental Principles and Description1 In a sinusoidal current circuit, the load can be a resistor, inductor, or capacitor, or a combination of them.

The load can be equivalent with impedance or admittance. If the impedance z=r+jx is used to represent the circuit parameters, the load can be regarded as a series connection between the resistor r and the reactance x only. If the circuit parameters are represented by admittance y=g+jb, the load is regarded as the parallel connection of conductance g and accommodance b.

2. The method of measuring AC circuit parameters with AC voltmeter, ammeter and power meter is called three-meter method or voltammetry method. It is the basic method for measuring the parameters of sinusoidal current circuits. The experimental circuit diagram is shown in Figure 8-1, the voltage regulator provides the experimental voltage, the voltmeter monitors the voltage of the element, the ammeter monitors the current of the element, and the power meter measures the active power consumed by the element.

Therefore, when using the three-meter method, the voltmeter, ammeter, and power meter must measure the voltage, current, and power of the component under test. The values of u, i, and p measured from the three-table method cannot distinguish whether the measured impedance is capacitive or inductive, and can generally be determined by the following methods. (1) A test capacitor of appropriate capacity is connected at both ends of the tested element, if the reading of the ammeter increases, the measured element is capacitive; If the reading of the ammeter decreases, it is inductive.

The capacitance c of the test capacitor can be selected according to the inequality: b < 2b where b is the accommodation of the test capacitance; b is the equivalent charge of the component under test.

It's too general, which test do you want?

( ) a, when measuring resistance, both hands touch the metal rod of the pen, hands and the resistance to be measured in parallel, the measured value will be small, so a correct; b. The ohmmeter has a built-in power supply, and when measuring the resistance of the circuit, if the circuit is not disconnected from the power supply, the meter head may be burned, so B is correct; c. When using an ohmmeter to measure the resistance, select the appropriate gear according to the resistance value of the resistance to be measured.

Question Answers: ABC Question Analysis: Analysis:

As can be seen from the circuit diagram, the voltmeter measures the voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and then judges according to the experimental principle in the option Answer: a. The voltmeter measures the voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and the bulb resistance is calculated according to Ohm's law, and the voltage at both ends of the bulb is changed by the sliding rheostat to obtain multiple sets of data to obtain the law, so the resistance of the small bulb can be measured, so it is in line with the topic; b. The voltmeter measures the voltage at both ends of the bulb, the ammeter measures the current through the bulb, and the electrical power of the small bulb can be obtained according to P=UI, and the actual power of the bulb under different voltages is measured by changing the voltage and current through the sliding rheostat, and the law is obtained by comparison, so the actual power of the small bulb can be measured, so it is in line with the topic; c. The voltmeter measures the rated voltage at both ends of the bulb, and the ammeter measures the current through the bulb, and the rated power of the small bulb can be obtained according to P=UI, so it is in line with the topic; D. Determine the relationship between the current and voltage of the small bulb connected in series and parallel, the bulb needs to be connected in series and parallel, and the series and parallel connection can not be done at the same time, so it does not meet the meaning of the topic Therefore, the abc Comments: This question examines the analysis of the experimental circuit diagram, the key is to understand the principle of each experiment and the role of the circuit elements, it should be noted that this circuit diagram is only a part of the circuit, and it is analyzed and judged according to the knowledge and experimental principles accumulated in ordinary times