back e.m.f.

简明释义

反电动势

英英释义

例句

1.The motor's speed is affected by the back e.m.f. 反电动势 generated during operation.

电机的速度受操作过程中产生的back e.m.f. 反电动势影响。

2.Understanding back e.m.f. 反电动势 is crucial for designing efficient electric motors.

理解back e.m.f. 反电动势对于设计高效电动机至关重要。

3.A higher back e.m.f. 反电动势 results in lower power consumption.

更高的back e.m.f. 反电动势会导致较低的功耗。

4.The back e.m.f. 反电动势 limits the maximum current in a circuit.

back e.m.f. 反电动势限制了电路中的最大电流。

5.When the load increases, the back e.m.f. 反电动势 also rises, reducing the current flow.

当负载增加时，back e.m.f. 反电动势也会上升，从而减少电流流动。

作文

In the study of electromagnetism and electrical engineering, the concept of back e.m.f. (back electromotive force) is crucial for understanding how electric motors and generators operate. When a motor runs, it converts electrical energy into mechanical energy. However, as the motor spins, it also generates an opposing voltage, known as back e.m.f. This phenomenon occurs due to the motion of the motor's rotor within a magnetic field, which induces a voltage that opposes the input voltage supplied to the motor. This opposing voltage can significantly affect the performance and efficiency of the motor.To grasp the importance of back e.m.f., consider a simple example: an electric fan. When you turn on the fan, electricity flows through the motor, causing the blades to spin. As the blades rotate, they cut through the magnetic field, generating back e.m.f.. This generated voltage reduces the amount of current flowing into the motor, which in turn affects the power consumption of the fan. Without back e.m.f., the motor would draw excessive current, leading to overheating and potential damage.The relationship between the input voltage, current, and back e.m.f. can be described by Ohm's law and Kirchhoff's voltage law. Essentially, the total voltage supplied to the motor is equal to the sum of the back e.m.f. and the voltage drop across the motor's internal resistance. Therefore, as the speed of the motor increases, the back e.m.f. also increases, leading to a decrease in the net current flowing through the motor. This self-regulating mechanism helps maintain a stable operation of the motor under varying load conditions.Additionally, the concept of back e.m.f. is not limited to just motors; it is also present in generators. In a generator, mechanical energy is converted back into electrical energy. As the generator spins, it produces a voltage that also generates back e.m.f.. This opposing voltage must be overcome to maintain the desired output voltage. Understanding back e.m.f. in generators is essential for designing systems that efficiently convert mechanical energy into electrical energy without wasting resources.In summary, back e.m.f. plays a vital role in the functioning of both electric motors and generators. It serves as a natural regulator of current flow, ensuring that devices operate efficiently and safely. By comprehending the implications of back e.m.f., engineers and technicians can design better electrical systems that optimize performance while minimizing energy waste. The study of back e.m.f. not only enhances our understanding of electromagnetic principles but also contributes to advancements in technology, making it a fundamental concept in the field of electrical engineering.

在电磁学和电气工程的研究中，反电动势（back electromotive force）这一概念对于理解电动机和发电机的工作原理至关重要。当电动机运行时，它将电能转化为机械能。然而，随着电动机的旋转，它也会产生一个相反的电压，称为反电动势。这一现象是由于电动机转子在磁场中的运动而引起的，这会产生一个与输入电压相反的电压。这种相反的电压会显著影响电动机的性能和效率。为了理解反电动势的重要性，可以考虑一个简单的例子：电风扇。当你打开风扇时，电流流过电动机，使叶片旋转。随着叶片旋转，它们切割磁场，从而产生反电动势。这个产生的电压减少了流入电动机的电流，这反过来又影响了风扇的功耗。如果没有反电动势，电动机将会消耗过多的电流，导致过热和潜在的损坏。输入电压、电流与反电动势之间的关系可以通过欧姆定律和基尔霍夫电压定律来描述。基本上，施加到电动机上的总电压等于反电动势和电动机内部电阻上的电压降之和。因此，随着电动机速度的增加，反电动势也会增加，从而导致流经电动机的净电流减少。这一自我调节机制有助于在不同负载条件下保持电动机的稳定运行。此外，反电动势的概念不仅限于电动机；它在发电机中也存在。在发电机中，机械能被转化回电能。当发电机旋转时，它会产生电压，同时也会产生反电动势。这个相反的电压必须克服，以维持所需的输出电压。理解发电机中的反电动势对于设计能够有效将机械能转化为电能而不浪费资源的系统至关重要。总之，反电动势在电动机和发电机的功能中发挥着至关重要的作用。它作为电流流动的自然调节器，确保设备高效、安全地运行。通过理解反电动势的影响，工程师和技术人员可以设计更好的电气系统，以优化性能并最小化能源浪费。对反电动势的研究不仅增强了我们对电磁原理的理解，而且促进了技术的进步，使其成为电气工程领域的基本概念。