Abstract
This chapter describes the role of trigonometry in electrical problems. The radius of a circle is the number of degrees that would be covered if the radius of that circle were bent along the circumference. The fight triangle is utilized to solve values of current, voltage, and phase angle in resistor–capacitor (RC), LR, and LCR circuit voltage and phase angle in RC, LR, and LCR circuits when an AC voltage is applied. The two numbered scales which intersect perpendicularly at their origins form a rectangular coordinate system. The horizontal coordinate is called the abscissa. Application of the sine, cosine, and tangent are necessary to solve for current, voltage, and impedance values in AC circuits. The Pythagorean theorem is used to determine the relationship between applied voltage and voltage drops in RL and RC circuits. It is found that the Pythagorean theorem is used to determine the relationship between circuit impedance and circuit reactance (RL or RC) circuits.
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