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Read the passage.
AC vs. DC
In the 1880s, the War of the Currents began. Thomas Edison developed direct current, or DC, a type of electricity that flows in one direction. By 1887, DC was in use around the United States. It had some drawbacks, though. Converting it to lower or higher voltages was difficult; that is, the current's force couldn't be changed easily. Transmitted at the low voltage needed for use in homes and businesses, it lost power after traveling only a mile. Meanwhile, Nikola Tesla was working with alternating current, or AC. AC reverses direction many times per second and can be changed to different voltages. At high voltage, it can be transmitted efficiently, traveling hundreds of miles with little energy loss. Because of its advantages, AC triumphed by the end of the nineteenth century.

What is the main idea of the passage?

AC has distinct advantages over DC, so AC won the War of the Currents.

AC reverses direction and can be converted to lower or higher voltage.

What is the main idea?

Answer :

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Answer: "AC has distinct advantages over DC, so AC won the War of the currents."

The main and the central idea about the passage is (1)AC has distinct advantages over DC, so AC won the War of the Currents.

Explanation:

The given passage talks about the War between Currents.

There are two types of currents being talked about- DC and AC. The passage tells us that the use of DC was prevalent in the 18th centaury and after development of the AC current, it took over DC and was then used all over the world because it had distinct advantages.

Therefore, the main idea of the passage is AC has distinct advantages over DC, so AC won the War of the Currents.

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