Kelvin bridge

简明释义

开尔文电桥

英英释义

例句

1.The Kelvin bridge is essential for minimizing errors in low-resistance measurements.

开尔文桥对于减少低电阻测量中的误差至关重要。

2.Using a Kelvin bridge, the technician could determine the resistance of the circuit with high precision.

技术员使用开尔文桥可以高精度地确定电路的电阻。

3.In our physics lab, we learned how to set up a Kelvin bridge for precise resistance measurements.

在我们的物理实验室，我们学习了如何搭建一个开尔文桥以进行精确的电阻测量。

4.To calibrate the device, we connected it to a Kelvin bridge to ensure accuracy.

为了校准设备，我们将其连接到开尔文桥以确保准确性。

5.The engineer used a Kelvin bridge to measure the resistance of the wire accurately.

工程师使用开尔文桥准确测量了电线的电阻。

作文

The Kelvin bridge is a sophisticated electrical circuit used for measuring low resistances with high precision. It is named after Lord Kelvin, a prominent physicist known for his work in thermodynamics and electrical engineering. The Kelvin bridge operates on the principle of null measurement, which means that it measures resistance by comparing an unknown resistance to a known standard without passing any current through the unknown resistance. This is crucial because passing current can change the temperature of the resistor, leading to inaccurate readings.In practical applications, the Kelvin bridge is often used in laboratories and industrial settings where accurate measurements of low resistances are critical. For example, in the manufacturing of electronic components, ensuring that the resistors meet specific standards is vital for the overall functionality of devices. The Kelvin bridge allows engineers to test these components with great accuracy, thereby maintaining quality control in production.To understand how the Kelvin bridge works, we must first look at its components. The bridge typically consists of four resistors arranged in a diamond shape, with a galvanometer connected between two opposite points. Two of the resistors are known values, while the other two include the unknown resistance and a variable resistor. By adjusting the variable resistor until the galvanometer reads zero, the balance condition is achieved. At this point, the ratio of the known resistors can be used to calculate the unknown resistance accurately.One of the significant advantages of using the Kelvin bridge is its ability to eliminate errors caused by lead and contact resistances. In traditional methods of measuring resistance, the resistance of the leads connecting the measuring instrument to the resistor can introduce significant errors, especially when dealing with very low resistances. However, the Kelvin bridge design mitigates this issue, allowing for more reliable measurements.Moreover, the Kelvin bridge can also be adapted for different ranges of resistance measurements. By selecting appropriate resistor values and configurations, it can measure resistances from micro-ohms to ohms, making it a versatile tool in both research and industry. This adaptability is particularly beneficial in fields like materials science, where researchers may need to measure the conductivity of various materials under different conditions.In conclusion, the Kelvin bridge is an essential instrument in the field of electrical measurements. Its ability to provide precise measurements of low resistances without the influence of lead resistance makes it invaluable in various applications, from quality control in manufacturing to advanced research in physics and materials science. Understanding the principles and operation of the Kelvin bridge not only enhances our knowledge of electrical engineering but also highlights the importance of precision in scientific measurements. As technology continues to advance, the relevance of the Kelvin bridge will undoubtedly persist, ensuring accurate and reliable resistance measurements for years to come.

凯尔文桥是一种复杂的电路，用于高精度测量低电阻。它以著名物理学家开尔文勋爵的名字命名，他在热力学和电气工程方面的工作而闻名。凯尔文桥的工作原理是零测量，这意味着它通过将未知电阻与已知标准进行比较来测量电阻，而不通过未知电阻传递任何电流。这一点至关重要，因为通过电流会改变电阻的温度，从而导致读数不准确。在实际应用中，凯尔文桥通常用于实验室和工业环境中，在这些地方，准确测量低电阻至关重要。例如，在电子元件的制造中，确保电阻器符合特定标准对于设备的整体功能至关重要。凯尔文桥使工程师能够以极高的精度测试这些组件，从而在生产中保持质量控制。要理解凯尔文桥的工作原理，我们首先需要了解它的组成部分。该桥通常由四个电阻器按照菱形排列组成，两个对角连接一个电流计。两个电阻是已知值，而另外两个包括未知电阻和一个可变电阻。通过调整可变电阻直到电流计读数为零，达到平衡条件。在此时，已知电阻的比率可以用来准确计算未知电阻。使用凯尔文桥的一个显著优点是它能够消除由引线和接触电阻引起的误差。在传统的电阻测量方法中，连接测量仪器与电阻器的引线电阻可能会引入显著的误差，特别是在处理非常低的电阻时。然而，凯尔文桥的设计减轻了这个问题，从而允许更可靠的测量。此外，凯尔文桥还可以适应不同范围的电阻测量。通过选择适当的电阻值和配置，它可以测量从微欧到欧姆的电阻，使其成为研究和工业中的多功能工具。这种适应性在材料科学等领域尤为有益，研究人员可能需要在不同条件下测量各种材料的导电性。总之，凯尔文桥是电气测量领域的重要仪器。它能够提供精确的低电阻测量，而不受引线电阻的影响，使其在各种应用中都具有不可或缺的价值，从制造业的质量控制到物理和材料科学的先进研究。理解凯尔文桥的原理和操作不仅增强了我们对电气工程的知识，也突显了科学测量中精度的重要性。随着技术的不断进步，凯尔文桥的相关性无疑会持续存在，确保未来多年内电阻测量的准确性和可靠性。