HVAC Electricity Chapter 7 Questions with Correct Answers

What are the two types of current use din the heating, cooling and refrigeration industries? AC (mostly) DC _____ current flows in only one direction. DC _____ current flows in alternating directions. AC What are the advantages of AC current over DC current? 1) cheaper 2) easier to produce 3) easier to transform from one voltage to another How is AC produced? by cutting through the magnetic field with a conductor What is a sine wave? a graphical representation of AC How many times on a sine wave is voltage at zero? three times When the conductor rotates through one complete revolution, it has generated two alternations (flow intervals, meaning changes directions twice). Two alternations equals how many cycles? one what is a cycle? when the rotor, or conductor, cuts the magnetic field of a north pole and south pole The number of complete cycles that occur in one second is known as _____. frequency In the United states, what frequency is considered "standard" frequency? 60 Hz Alternating current reaches a peak at ______ degrees. 90* What is the calculation for effective current? peak voltage x .707 = effective current (RMS)