JAMB Exam > JAMB Videos > Physics for JAMB > Introduction to Alternating Current
Introduction to Alternating Current Video Lecture | Physics for JAMB
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FAQs on Introduction to Alternating Current Video Lecture - Physics for JAMB
| 1. What is alternating current (AC)? |  |
Ans. Alternating current (AC) is an electric current that periodically changes its direction. It flows in a two-way alternating fashion, constantly reversing its polarity. This type of current is commonly used in homes and businesses to power electrical devices.
| 2. How is alternating current generated? | |
Ans. Alternating current is generated using devices called alternators or generators. These devices convert mechanical energy into electrical energy by rotating a coil of wire within a magnetic field. As the coil rotates, it produces an alternating current due to the changing magnetic field.
| 3. What are the advantages of alternating current over direct current? | |
Ans. Alternating current has several advantages over direct current. Firstly, AC can be easily transformed to different voltage levels using transformers, which is crucial for long-distance power transmission. Additionally, AC can be generated more efficiently and at higher voltages, reducing energy losses during transmission. AC is also safer to use as it can be easily controlled and interrupted.
| 4. What are the applications of alternating current? | |
Ans. Alternating current finds a wide range of applications in our daily lives. It is used to power electrical appliances in homes, offices, and industries. AC is essential for operating electric motors, refrigerators, air conditioners, and lighting systems. It is also used in electric vehicles, power grids, and various electronic devices.
| 5. What is the frequency of alternating current? | |
Ans. The frequency of alternating current refers to the number of complete cycles it completes per second. In most countries, the standard frequency for AC power is 50 or 60 hertz (Hz). A frequency of 50 Hz means that the current changes direction 50 times in one second, while a frequency of 60 Hz indicates 60 changes in direction per second.
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Nov 22, 2024 Last updated |
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