![]() That will be a line that has a y-intercept of 2 and a slope of -2. Part B: Verify that these points satisfy the system of inequalities by substituting (x, y) for both points into both inequalities. To do this changes our linear equations to linear inequalities.Īll points above y = -x + 2 would then be y > -x + 2Īll points below y = -x + 9 would then be y < -x +9 So if we include all points above the first line and all points below the second line, we obtain our intersected shaded area. Y = -x + 2 has C and F above it and all other noted points below it. y = -x + 9 has all the points below it on the graph. The shaded area should be between these to lines only. So I'd draw two lines that slant downward at 45° below point C and another parallel line above point F. Any other reproduction is prohibited without permission.Part A: You want two inequalities such that they overlap. Reproduction for personal use is permitted only if this copyright notice is maintained. To comment on this title or this review, send mail to © the Manitoba Library Association. With its scientific slant and rich historic atmosphere, Zap! is another 'hats off' addition to the series.Īileen Wortley is a retired librarian from Toronto, ON. Bill Slavin is the illustrator of over a hundred books and has received many nominations and awards. Monica Kulling has written over fifty titles for children, including picture books and biographies. His representations of Tesla, Westinghouse and Edison are remarkably similar to their photographs! In a series of double page spreads, Slavin's whimsical illustrations reflect the atmosphere of the times, conveying action and vitality and bringing the story to life. The luscious artwork of Bill Slavin, in the form of digitally coloured pen and ink drawings, complements the text perfectly. The readability of Zap! will encourage children to learn more of this fascinating and rather eccentric man. She depicts the inventor as a real personality, complete with idiosyncrasies, showing him as a man of pride, with a burning eagerness to bring his ideas to fruition. Kulling conveys the impact of Tesla's invention while simultaneously creating a meaningful and engaging story. A poem about Tesla's childhood and later predictions regarding the future use of robots provide an extra dimension. A bibliography, including books and websites, encourages further reading. Coincidentally, the reader also gets a snapshot of Thomas Edison through his "charged" relationship with Tesla. In this, the ninth in the series, the reader is provided with a peek into Tesla's achievements and personality as well as a simple explanation of the concept of electrical currents. Gradually, his theory of alternating current gained acceptance.Īimed at children aged six to ten, the "Great Idea" series of picture book biographies usually features lesser-known inventors. Two years later, Tesla's childhood dream of building the first hydro-electric plant in Niagara Falls came to fruition. He also gave Tesla the opportunity to turn his theories into reality by providing electricity for the 1893 Chicago World Fair. However, Tesla found support in George Westinghouse, entrepreneur and engineer, who gave him a job. With opposing views on the efficiency of alternating versus direct electrical current and with distinctly opposite natures, their relationship did not last. He came to New York when he was 28, hoping to gain employment with Thomas Edison. As a child, he had an amazing memory and was something of a prodigy. Nikola Tesla was born in 1856 in Croatia. When the work was done, Edison refused to pay. He offered Tesla fifty thousand dollars to make direct current more efficient. You could send power over great distances and not have to build as many power stations."īut Edison had invested a lot of time and money in his system. "Machines would be more efficient if they ran on alternating current," explained Tesla. "The future belongs to direct current," he said. In alternating current, the direction reverses, or alternates, sixty times per second.īut Thomas Edison was only interested in his own system. In direct current, the electrical current always flows in the same direction between the positive and negative terminals. In 1882, he'd had a vision of a motor that ran on alternating current electricity. Nikola Tesla came to America with a dream. (Thomas Elva), 1847-1931-Juvenile literature. Inventors-United States-Biography-Juvenile literature.Įlectrification-History-Juvenile literature.Įdison, Thomas A. Tesla, Nikola, 1856-1943-Juvenile literature.Įlectrical engineers-United States-Biography-Juvenile literature. CM Magazine: Zap! Nikola Tesla Takes Charge.
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