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