Electricity for HVAC Questions with Correct Solutions, Graded to Pass, A+

What does NEC stand for? - National Electric Code What is Ampacity? - The current carrying capacity of wire or cable expressed in amperes or amps. What is EMF? - Electromotive Force (volts) What is Amperage? - The measurement of electrical flow in a conductor. You check volts in parallel or series? - parallel You check amps in parallel or series? - series What is Voltage? - The difference in potential force between two points. Most often called Electromotive Force (EMF). Resistance is measured in ____. - ohms Current is measured in ______. - amps Amps are indicated by what letter? - A or I Resistance is indicated by what letter? - R Voltage is indicated by what letter? - E or V Good conductors have ______ resistance. - low Poor conductors or insulators have _______ resistance. - high A device that uses power is referred to as a _____? - Load Controls can be either _____ or _____. - operators, safeties Provides a path for current to flow. - conductors Disconnect power to measure _______. - ohms Voltage is divided between each load in a _____ circuit. - series Voltage is the same to each load in a _____ circuit. - parallel Matter is made up of _____. - atoms Like charges _______ each other. - repel Opposite charges ________ each other. - attract Electrons moving down a conductor are referred to as _____ electrons. - free What are examples of good conductors: - gold, silver, copper, aluminum Magnets have lines of force that are called _______. - magnetic flux _____ current travels in one direction. - Direct _____ current flows from negative pole to positive pole. - Direct _____ current is more economical than _____ current. - Alternating, Direct In _____ current, electron flow changes direction. - alternating