electro motive force

简明释义

电动力

英英释义

例句

1.Ohm's law relates voltage to electro motive force in electrical circuits.

欧姆定律将电压与电路中的电动势联系起来。

2.The electro motive force of a solar cell is influenced by the intensity of sunlight.

太阳能电池的电动势受阳光强度的影响。

3.The battery generates an electro motive force that drives the current through the circuit.

电池产生的电动势推动电流通过电路。

4.In a generator, mechanical energy is converted into electro motive force.

在发电机中，机械能被转化为电动势。

5.A higher electro motive force results in a stronger electric current.

更高的电动势会导致更强的电流。

作文

The concept of electro motive force is fundamental in the field of electromagnetism and electrical engineering. It refers to the energy per unit charge that is imparted by an energy source, such as a battery or generator, to drive electric current through a circuit. Understanding electro motive force is crucial for anyone studying electricity, as it lays the groundwork for comprehending how electrical systems operate. When we talk about electro motive force, we often use the symbol 'EMF' to represent it. This term is somewhat misleading, as it does not refer to a force in the traditional sense, but rather to a potential difference that drives the flow of electrons. The unit of electro motive force is volts (V), which is the same unit used to measure voltage. In essence, electro motive force can be thought of as the 'pressure' that pushes electric charges through a conductor, allowing them to do work, such as lighting a bulb or powering a motor.A practical example of electro motive force can be found in everyday batteries. When a battery is connected to a circuit, it creates a potential difference between its terminals. This potential difference is the electro motive force that causes electrons to flow from the negative terminal to the positive terminal, thus generating current. The strength of the electro motive force depends on the type of battery and its chemical composition. For instance, a typical alkaline battery has an EMF of about 1.5 volts, while a lithium-ion battery can have an EMF of around 3.7 volts.In addition to batteries, generators also produce electro motive force. When mechanical energy, such as that from wind or water, is converted into electrical energy, the generator creates a potential difference that serves as the electro motive force. This process is governed by Faraday's Law of Electromagnetic Induction, which states that a change in magnetic flux through a circuit induces an EMF. This principle is the backbone of many power generation systems used today, including hydroelectric plants and wind turbines.Furthermore, understanding electro motive force is essential when analyzing circuits. Ohm's Law, which relates voltage (V), current (I), and resistance (R) in a circuit, can be applied to circuits with a known electro motive force. According to Ohm's Law, V = IR, where V is the voltage or electro motive force, I is the current in amperes, and R is the resistance in ohms. By manipulating this equation, engineers can design circuits that optimize performance and efficiency.In conclusion, electro motive force is a critical concept that underpins much of modern electrical engineering and technology. Whether in the context of batteries, generators, or circuit analysis, a solid grasp of electro motive force allows students and professionals alike to innovate and improve electrical systems. As technology continues to advance, the importance of understanding electro motive force will only grow, making it an indispensable part of the study of electricity.

电动势的概念在电磁学和电气工程领域中是基础性的。它指的是由能量源（如电池或发电机）赋予每单位电荷的能量，以推动电流通过电路。理解电动势对任何学习电力的人来说都是至关重要的，因为它为理解电气系统的运作奠定了基础。当我们谈论电动势时，我们通常使用符号“EMF”来表示这个术语。这一术语有些误导，因为它并不指代传统意义上的力，而是指推动电子流动的电位差。电动势的单位是伏特（V），这与电压的测量单位相同。从本质上讲，电动势可以被视为推动电荷通过导体的“压力”，使它们能够完成工作，比如点亮灯泡或驱动电动机。电动势的一个实际例子可以在日常电池中找到。当电池连接到电路时，它在其端子之间产生电位差。这个电位差就是电动势，它使电子从负极流向正极，从而产生电流。电动势的强度取决于电池的类型及其化学成分。例如，典型的碱性电池的电动势约为1.5伏，而锂离子电池的电动势约为3.7伏。除了电池，发电机也会产生电动势。当机械能（例如来自风或水的能量）转换为电能时，发电机会创造出作为电动势的电位差。这个过程遵循法拉第电磁感应定律，该定律指出，电路中的磁通量变化会诱发电动势。这个原理是今天许多发电系统的基础，包括水电站和风力涡轮机。此外，在分析电路时，理解电动势也是至关重要的。欧姆定律将电路中的电压（V）、电流（I）和电阻（R）联系在一起，可以应用于已知电动势的电路。根据欧姆定律，V = IR，其中V是电压或电动势，I是以安培计的电流，R是以欧姆计的电阻。通过操纵这个方程，工程师可以设计出优化性能和效率的电路。总之，电动势是现代电气工程和技术的关键概念。无论是在电池、发电机还是电路分析的背景下，对电动势的深入了解使学生和专业人士能够创新和改善电气系统。随着技术的不断进步，理解电动势的重要性只会增加，使其成为电力研究中不可或缺的一部分。