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Alternating Current (AC) Vs Direct Current (DC)
Akash Peshin 6 months ago
Prev Article Next Article

The AC versus DC debate personifies the War of Currents, as it is now called, in which the two giants of electric power were embroiled in the late 1890s. Thomas Edison, the proprietor of Direct Current, was so threatened by Tesla ’s invention that, in order to discredit Alternating Current, he resorted to falsely misleading Americans. Apprehensive about losing his royalties to this new technology , Edison went so far as toelectrocute an elephant to show Alternating Currents’ fatal dangers.

However, this did not stop Tesla from fulfilling his dream of powering the United States with cheap and highly efficient energy.Even now, we see long and thick wires tightly strung between soaring electrical towers like the strings of a guitar. AC took over the throne and reigned for a century, dominating households, offices and buildings, until now, when DC seems to be gradually making a comeback. Why did AC fare so well? And why might DC make a comeback? Let’s rephrase these questions.

Why is AC better than DC?

Alternating current is a type of current in which the electrons periodically switch directions back and forth. It is based on the principles devised by Michael Faraday in 1832 when he illustrated his dynamo electric generator. Despite being so celebrated, DC exhibited a major problem — transmitting it over longer distances was really difficult. The wires lost power and had to be rejuvenated using additional circuitry. Furthermore, upgrading or downgrading DC voltages also required complicated circuits.

AC could not only be transmitted over long distances easily but could also be conveniently converted to higher or lower values using transformers. A transformer is essentially a coiled up wire that “steps up” or “steps down” the magnitude of AC voltage. The ability to transform voltage in this manner meant that it was possible to transmit electrical power much more efficiently, not only across cities, but across the entire nation. Tesla’s dream was gradually becoming a reality.

(Image Credit:

The ability to carry power across long distances was the most important advantage of AC over DC,regarding which houses and buildings discontinued DC power in the 19 th century. In 1893, General Electric waschosen to power The Chicago World’s Fair with DC, which would cost an exorbitant $554,000. However, George Westinghouse intervened and promised to power the fair for only $399,000 with Tesla’s AC. Three years later, Niagara Falls Power Company, seduced by AC’s amenities, awarded Westinghouse the right to generate power from Niagara Falls and illuminate all of Buffalo, New York. AC obliterated DC once and for all. Then, a few decades later, the transistor was born.

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By Sarah Toy

Published: July 3, 2018 2:32 p.m. ET


27% of consumers in a Cowen survey said they used Netflix most often to watch video, more than cable, broadcast or YouTube


U.S. consumers are using Netflix to watch video content more than any other platform, according to a survey of 2,500 people by financial firm Cowen Co.

In the survey, Cowen Co. asked respondents, “Which platforms do you use most often to view video content on TV?” Netflix NFLX, -1.92% came in first with 27% of respondents saying they used the streaming giant most often. Next in line was basic cable with 20%, and broadcast came in third, with 18.1%.

Netflix is an especial favorite with younger viewers, analysts at Cowen Co. said. Almost 40% of respondents aged 18 to 24 years old said they used Netflix most often to view video content, 23% more than Alphabet-owned GOOGL, -2.26% YouTube, which was second among young respondents.

Even when Cowen Co. excluded people who had never used cable and those who had dropped their cable subscriptions, Netflix still came in second with 24%, just under basic cable with 26%.

The survey “highlights the importance of Netflix in the home, particularly among millennials,” wrote Cowen Co. senior research analyst John Blackledge.

In case you missed it: Why Amazon, Netflix and Tesla shares may get an extra bump until the end of June

In case you missed it:

Also: Netflix stock surges above $400 in falling market as three analysts raise price targets

Netflix shares have performed well as the streaming giant gains more subscribers and invests heavily in content, with shares more than doubling in price so far this year. Investors remain bullish about its prospects and are expecting strong results when the company reports its second-quarter earnings on July 16.

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