Leonard has likened her to The Hulk when she gets angry, When her car's engine finally fails in Season 7, Leonard buys her a new one so she can go to auditions and pursue her dream of becoming an actress.
In Season 8, after finding a job as a highly paid pharmaceutical sales representative at Bernadette's company, she obtains a company car and sells the one Leonard bought for her, returning him the money.
In contrast to the rest of the group, Penny is not well educated nor savvy in a specific technical field, but she has great social skills and is more streetwise than her neighbors. Having dropped out of community college prior to the start of the series, she is the only regular character with less education than Howard Wolowitz, who has a master's degree.
She is the primary female character in the series, befriending her across-the-hall neighbors Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons), two physicists who work at the nearby California Institute of Technology (Caltech).Penny takes care of Sheldon while he is ill Despite not being as well versed as the men in geek culture, Penny has shown attention to what each of her friends likes, although she still remains dismissive of them: during a Christmas episode, Penny gives Sheldon a signed napkin autographed by Leonard Nimoy.In return, Sheldon gives Penny several baskets of bath products and then a long hug, to both her and Leonard's surprise.By the middle of the season, she is also taking an acting class, and at the beginning of season 7, she is taking a psychology class as well. While Sheldon routinely disparages both Penny's and Howard's educations, he occasionally acknowledges her intelligence and potential, though he rarely treats Howard so.He has also asked for her advice more than once regarding various social situations.