left-hand rule (english) - meaning, definition, translation, pronunciation

Part of Speech

Noun

Phonetic Transcription

/lɛft hænd ruːl/

Meaning and Usage

The "left-hand rule" refers to a mnemonic device used primarily in physics and engineering, particularly in the context of electromagnetism. It helps individuals determine the direction of force, magnetic field, and current flow in electric motors and generators. The rule states that if you align the first finger of your left hand in the direction of the magnetic field (B), the second finger in the direction of the current (I), then your thumb will point in the direction of the force (F) acting on the conductor.

In terms of frequency, the term is primarily seen in written contexts, such as textbooks and academic articles, due to its specialized nature.

Example Sentences

1. When learning about electric motors, students often apply the left-hand rule to predict the direction of the force on the conductor.

2. 在学习电动机时，学生们通常使用左手规则来预测导体上力的方向。

3. The left-hand rule is essential for understanding how generators operate in converting mechanical energy into electrical energy.

4. 左手规则对于理解发电机如何将机械能转化为电能是必不可少的。

5. During the physics lab, we practiced using the left-hand rule to determine the effects of magnetic fields on electric currents.

6. 在物理实验室中，我们练习使用左手规则来确定磁场对电流的影响。

Idiomatic Expressions

The "left-hand rule" does not have widely recognized idiomatic expressions since it is specific to technical contexts. However, we can look at phrases that contain "left-hand" or "rule":

1. Right-hand man
2. "In any organization, you need a left-hand man to help manage the workload effectively."

3. “在任何组织中，你需要一个得力助手来帮助有效管理工作负担。”

4. Rule of thumb

5. "As a rule of thumb, people often use the left-hand rule when dealing with electrical circuits."

6. “作为经验法则，人们在处理电路时通常使用左手规则。”

7. Keep your left hand clean

8. "In the realm of politics, it's wise to keep your left hand clean while making tough decisions."
9. “在政治领域，作出艰难决定时，保持左手的干净是明智的。”

Etymology

The term "left-hand rule" combines the adjective "left-hand," indicating the side opposite to right, and "rule," which refers to a prescribed guide for conduct or action. The use of "left" in this context contrasts it with the "right-hand rule," another mnemonic device used in similar physical contexts. The terminology has evolved from common vernacular into specialized academic language within the fields of physics and engineering.

Synonyms and Antonyms

• Synonyms: left-hand method, left-hand mnemonic
• Antonyms: right-hand rule

The "left-hand rule" has specific applications and does not have direct synonyms or antonyms beyond structural contrasts within similar contexts.