How did The Flash get his power?
Iris West always had the feeling that Barry's The Flash, but she was not sure about it. She became sure after an incident. In season 1, Eddie Thawne was ready to propose Iris, but suddenly the reverse flash Eobard Thawne came and kidnapped Eddie. Then Iris wanted help to Barry Allen. Barry promised her to bring Eddie back. He told this by holding her hand, and at that time, it creates an electric pulse when he leaves. Iris got the same phenomenon when she touched Barry at his coma time. Then Iris understood that Barry is the flash. She also later find out that Wally West is the kid flash who has a relationship with Barry.
In 1990, Iris West appeared in CBS Television series. Candice Patton played the part of Iris. In 2014, Candice Patton again played the role of Iris in The Flash tv series. Later in the movie Justice League, Kiersey Clemon was in the role of Iris West.
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There are four flash characters in the DC comics. Jay Garrick, Barry Allen, Wally West, and Bart Allen. So they have different ways and sources of getting powers.
At first, Jay Garrick, he was from the Golden Age- later belonging ti Earth-two. He inhaled the vapors of hard water and then, massive water ti gain his superspeed.
Barry Allen was from the Silver Age. Barry Allen was a forensic scientist for the police department. One day while he was working on his lab, at the same time, Star lab was making another invention called The Particle Excelerator. But unfortunately, a malfunction happened there. It blew up, scattering dark matter over the city. A thunderstorm was also happening at that time. When Barry was trying to close something on the ceiling of his lab, he was holding a metallic thing. With the thunderbolt on that metal chain, the lightning struck, and the dark matter also entered into his body. He was in a coma then. When he woke up, he felt that he has got the superpower. Because the particular piece of dark matter, made his body regenerate too much than a normal body. Thus he became the Flash and got powers.
Wally West also got power like the same way Barry got. He gained power as a kid flash. It was by an identical lab accident as Barry. He went to visit Barry, and Barry recreated the cabinet of chemicals to make Wally understand the whole thing. Then suddenly, lightning struck that coated him in energized chemicals was vanishingly unlikely. Wally got a costume and got the name kid flash.
Bart Allen got his powers by born. Because he has the blood of previous two flashes. His father, Don Allen, was the son of Barry, and his mother was Meloni Thawne. Thus he inherited the power and ability and became the last flash.