Class 12 Exam > Class 12 Videos > Alternating Current - Class 12, Physics
Alternating Current - Class 12, Physics Video Lecture
FAQs on Alternating Current - Class 12, Physics Video Lecture
| 1. What is alternating current? |  |
Ans. Alternating current (AC) is an electric current that periodically reverses direction. It is commonly used in households and industries to power electrical devices. Unlike direct current (DC), which flows in only one direction, AC changes direction periodically, typically in a sinusoidal waveform.
| 2. How is alternating current generated? | |
Ans. Alternating current is generated using an electrical generator or alternator. The generator consists of a coil of wire that rotates in a magnetic field. As the coil rotates, the magnetic field induces an alternating voltage in the coil, which generates the alternating current.
| 3. What is the difference between alternating current and direct current? | |
Ans. The main difference between alternating current (AC) and direct current (DC) is the direction of flow. AC changes direction periodically, while DC flows in only one direction. AC is typically used for power transmission over long distances and is suitable for operating motors and electrical appliances. On the other hand, DC is commonly used in batteries and electronic devices.
| 4. Why is alternating current used for power transmission? | |
Ans. Alternating current is used for power transmission over long distances due to several advantages. Firstly, AC can be easily transformed to higher or lower voltages using transformers, allowing efficient transmission with minimal loss. Secondly, AC generates less heat during transmission compared to DC, resulting in improved energy efficiency. Lastly, AC allows for the use of three-phase power systems, which further enhances power transmission capabilities.
| 5. What are the applications of alternating current? | |
Ans. Alternating current finds numerous applications in our daily lives and industries. Some common applications include powering household appliances, lighting systems, electric motors, and industrial machinery. AC is also used in electric power distribution grids, electric vehicles, and renewable energy sources such as wind turbines and solar panels.
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