Energy Conservation in a Motor-Driven Generator
| Autor: | James D. Wells, Douglas Goodman |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Electric motor Generator (computer programming) Electromotive force business.industry Electric potential energy Electrical engineering Physics::Physics Education General Physics and Astronomy Electric generator Education Power (physics) law.invention Energy conservation law business Energy (signal processing) |
| Zdroj: | The Physics Teacher. 59:210-212 |
| ISSN: | 1943-4928 0031-921X |
| DOI: | 10.1119/10.0003669 |
| Popis: | An electric motor converts electrical energy into mechanical work and an electric generator converts mechanical work into electrical energy. The symmetry between the motor and generator naturally leads to questions about creating a perpetual motion machine. The allure of this question has inspired textbook problems, physics education articles, and award-winning physics demonstrations. It is commonly taught that spinning a generator faster produces a larger electromotive force (EMF), because the generator’s instantaneous EMF is proportional to the angular rate of rotation. When making this point in class, students will often ask about an interesting thought experiment, which is depicted in Fig. 1. The student question is as follows: “If an electric motor is connected via a system of gears to an electric generator, so that the generator spins faster than the motor, then does the generator’s output power PG exceed the motor’s input power PM ?” |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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