CompTIA Network+ Practice Test

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Prepare for the CompTIA Network+ Exam. Utilize flashcards and multiple choice questions with detailed hints and explanations. Equip yourself for success!

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Which frequency is used for AC in the US and Canada?

50 Hz
60 Hz
120 Hz
240 Hz

The correct answer is: 60 Hz

In the United States and Canada, the standard frequency for alternating current (AC) electricity is 60 Hz. This means that the current changes direction 60 times per second. This frequency is established as the standard for power distribution and is used in most residential and commercial electrical systems. The choice of 60 Hz over other frequencies, such as 50 Hz, which is common in many other parts of the world, can be traced back to historical developments in electrical engineering and infrastructure. The use of 60 Hz is well-accepted, and electrical appliances and systems are designed to operate efficiently at this frequency, making it the backbone of power supply in North America. The other frequencies listed, such as 120 Hz and 240 Hz, are not standard for general electrical supply; rather, they might be found in specific applications or systems but are not used for general AC power distribution like the 60 Hz standard. Understanding this standard is essential for both practical electrical work and theoretical knowledge in network and electrical systems.