The Trigonometric Form of Complex Numbers Is Often Used by Electrical

question 72

Multiple Choice

The trigonometric form of complex numbers is often used by electrical engineers to describe the current I, voltage V, and impedance Z in electrical circuits with alternating current. Impedance is the opposition to the flow of current in a circuit. Most common electrical devices operate on 115-volt, alternating current. The relationship among these three quantities is . The real part of I represents the actual current delivered to an electrical appliance in amps. Approximate this current when and , and express the answer in rectangular form to two decimal places.

• A)1.55 amps
• B)1.48 amps
• C)1.43 amps
• D)2.95 amps
• E)1.33 amps

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Definitions:

Factors

Variables or components that contribute to a particular outcome or situation.

Deadweight Loss

The loss of economic efficiency that can occur when the equilibrium for a good or service is not achieved or is not achievable.

Excise Tax

A tax levied on the sale of specific goods and services, such as tobacco, alcohol, and gasoline.

Demand Curve

A graphical representation showing the relationship between the price of a good and the quantity demanded.