HVAC Electrical Midterm Exam Questions and
Answers All Correct
_____ are the particles that orbit the core of an atom - correct answers-electrons
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______ is the force that pushes free electrons through conductors - correct answers-voltage
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name 3 terms meaning voltage - correct answers-electromotive force (emf) potential difference and eletrical
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pressure
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a device used to generate electricity is called a - correct answers-voltage source
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name 6 voltage sources - correct answers-battery, generator, solar cell, thermocouple, alternator, transformer
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secondary
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is voltage current? - correct answers-no
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electric current is ________ flowing through a conductor - correct answers-electrons
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_______ is the measurement of current flow - correct answers-amperage
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amperage tells the _____ of electrons moving thru a conductor - correct answers-amount
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what device is used to check amperage? - correct answers-ammeter
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conductors provide a ____ for current - correct answers-path
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a circut with a complete path for current is said to have ________ - correct answers-continuity
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do wires have continuity? - correct answers-yes
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_______ _______ reverses direction at regular intervals - correct answers-alternating current
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current alternates (reverses direction) two times every _____ - correct answers-cycle
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ac in the usa flows at 60 cycles per _____ , which means the same as 60 _____ - correct answers-seconds,
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hertz
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__________ is the opposition to current flow - correct answers-resistance
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, resistance reduces the ______of electrons flowing thru a circuit - correct answers-amount
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amperage will be high through a circuit that has ___ resistance - correct answers-low
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name 2 types of resistance - correct answers-resistive, reactive
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counter e.m.f. is a type of _______ resistance - correct answers-reactive
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counter e.m.f. is produced by ________ in motion - correct answers-magnetism
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name 5 factors that affect the resistance of a device - correct answers-material length girth temperature and
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magnetism in motion
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the resistance of an open circuit will be _______ ohms - correct answers-infinite
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the resistance across a closed switch or wite should be ____ ohms - correct answers-zero
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all loads have __________ - correct answers-resistance
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name 6 loads - correct answers-lamp heater motor relay coul solenoid coul transformer primary
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resistive loads generate ____ and or _____ - correct answers-heat , light
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inductive loads generate ___________ - correct answers-electromagnetism
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name 4 inducitve loads - correct answers-motor relay coil solenoid coil transformer primary
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ohms law states 1____ will push 1 ___ through 1 ___ - correct answers-volt, amp, ohm
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ohms law formula is - correct answers-e = i x R
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if resistance does not change and voltage increases amperage will ______ - correct answers-increase
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if resistance does not change and voltage doubles amperage would ______ - correct answers-double
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if voltage does not change and resistance decreases amperage will _______ - correct answers-increase
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if voltage does not change and resistance is cut in half amperage will _____ - correct answers-double
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the ____ is the measurement of electric power - correct answers-watt
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watts law formula is - correct answers-p= i x e
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120 volts pushing 10 amps of current will generate ____ watts of power. (convert to kilowatts ____ kw) -
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correct answers-1200, 1.2
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which 120 volt load draws the most amperage, a 40 watt lamp or a 60watt lamp? - correct answers-60 watt
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which one has higher resistance, the 40 watt lamp or the 60 watt lamp? - correct answers-40 watt
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