e. m. f

简明释义

电动势

英英释义

例句

1.Understanding e. m. f 电动势 is crucial for anyone studying electromagnetism.

理解e. m. f 电动势对于任何学习电磁学的人来说都是至关重要的。

2.The device operates on the principle of e. m. f 电动势, generating voltage when a magnetic field changes.

该设备基于e. m. f 电动势的原理工作，当磁场变化时产生电压。

3.The e. m. f 电动势 in the generator was measured at 120 volts.

发电机中的e. m. f 电动势测量为120伏特。

4.In this circuit, the e. m. f 电动势 produced is sufficient to power the LED lights.

在这个电路中，产生的e. m. f 电动势足以为LED灯供电。

5.An increase in speed will lead to a higher e. m. f 电动势 output from the alternator.

速度的增加将导致交流发电机输出更高的e. m. f 电动势。

作文

In the realm of physics and engineering, the term e. m. f stands for electromotive force. It is a crucial concept that describes the energy provided per unit charge by an energy source, such as a battery or generator. Understanding e. m. f is essential for anyone studying electrical circuits, as it plays a fundamental role in how electricity flows and powers devices. Electromotive force can be thought of as the driving force behind electric current. When a voltage is applied across a circuit, it creates a potential difference that encourages electrons to move, resulting in an electric current. The e. m. f is measured in volts and is often represented by the symbol 'E'. One of the most important aspects of e. m. f is its relationship with resistance and current, which is described by Ohm's Law. According to this law, the current flowing through a conductor between two points is directly proportional to the voltage (or e. m. f) across the two points and inversely proportional to the resistance of the conductor. This relationship can be expressed mathematically as I = E/R, where I is the current, E is the electromotive force, and R is the resistance. In practical applications, e. m. f is not just a theoretical concept but has real-world implications. For instance, when designing electrical circuits, engineers must consider the e. m. f of the power sources they are using. If the e. m. f is too low, it may not be sufficient to drive the desired current through the circuit, leading to insufficient power for devices. Conversely, if the e. m. f is too high, it could cause excessive current flow, potentially damaging components. Moreover, the e. m. f is also affected by factors such as temperature and material properties. For example, the internal resistance of a battery can affect its e. m. f, especially as it discharges over time. This means that understanding how to measure and calculate e. m. f is vital for optimizing the performance of electrical systems. In summary, e. m. f or electromotive force is a foundational concept in the field of electricity and electronics. It represents the energy supplied per unit charge and is essential for understanding how electric circuits operate. By grasping the principles of e. m. f, students and professionals alike can better design, analyze, and troubleshoot electrical systems. As technology continues to advance, the importance of mastering concepts like e. m. f will only grow, making it a critical area of study for future engineers and scientists.

在物理和工程领域，术语e. m. f代表电动势。它是一个关键概念，描述了能量源（如电池或发电机）每单位电荷提供的能量。理解e. m. f对任何学习电路的人来说都是至关重要的，因为它在电流如何流动和为设备供电方面起着根本作用。电动势可以被视为电流背后的驱动力。当电压施加到电路上时，它会在两个点之间产生一个电位差，促使电子移动，从而导致电流产生。e. m. f以伏特为单位进行测量，通常用符号'E'表示。e. m. f最重要的方面之一是它与电阻和电流之间的关系，这由欧姆定律描述。根据这一法则，在两个点之间导体中流动的电流与两个点之间的电压（或e. m. f）成正比，与导体的电阻成反比。这个关系可以用数学公式I = E/R表示，其中I是电流，E是电动势，R是电阻。在实际应用中，e. m. f不仅仅是一个理论概念，而是具有现实世界的影响。例如，在设计电路时，工程师必须考虑他们使用的电源的e. m. f。如果e. m. f过低，可能不足以驱动电路中的所需电流，导致设备供电不足。相反，如果e. m. f过高，可能会导致过大的电流流动，可能损坏组件。此外，e. m. f还受到温度和材料属性等因素的影响。例如，电池的内阻可能会影响其e. m. f，尤其是在其放电过程中。这意味着了解如何测量和计算e. m. f对于优化电气系统的性能至关重要。总之，e. m. f或电动势是电力和电子学领域的基础概念。它代表每单位电荷提供的能量，是理解电路如何运作的关键。通过掌握e. m. f的原理，学生和专业人士可以更好地设计、分析和排除电气系统的故障。随着技术的不断进步，掌握像e. m. f这样的概念的重要性只会增加，使其成为未来工程师和科学家必修的关键研究领域。