5 Questions
Explain the difference between direct current (dc) and alternating current (ac) sources and circuits.
Direct current (dc) does not change direction with time, while alternating current (ac) varies like a sine function with time.
What is the main reason for the widespread use of alternating current (ac) in the transmission and distribution of electrical energy by power companies?
The main reason is that most of the electrical energy sold by power companies is transmitted and distributed as alternating current, and it can be easily and efficiently converted from one voltage to the other by means of transformers.
Why is alternating current (ac) voltage preferred over direct current (dc) voltage in most electrical devices?
AC voltage is preferred because it can be easily and efficiently converted from one voltage to the other by means of transformers, and electrical energy can be transmitted economically over long distances.
What is the characteristic feature of AC circuits?
AC circuits exhibit characteristics of voltages and currents that vary with time, commonly resembling a sine function.
Why is the electric mains supply in homes and offices considered an alternating voltage (ac voltage)?
The electric mains supply in homes and offices is considered an alternating voltage because it varies like a sine function with time.
Test your knowledge of alternating current with this quiz. Explore the fundamentals of AC circuits, including voltage variations and sine functions, and enhance your understanding of alternating voltage in homes and offices.
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