Progress 1030 Flashcards
Substance on which a physical object is composed is ___
Matter
Matter is composed of fundamental substances called
Elements
The smallest particle of an element that can exist alone or in combination is called
An atom
The smallest particle of a substance that maintains the properties of that substance is
a molecule
The law of electric charges states that like charges _____ and unlike charges ______
Repel ; Attract
______ is the cause static electricity
Friction
A material with free electrons is called a
Conductor
A material that retards the flow of electrons is called
An insulator
________, ________, and ________ are all terms used to describe electric pressure
Voltage, potential difference, and electromotive force
______ flows in one direction
Direct current
________ is supplied to most residences.
AC or alternating current
Current flow is measured in
Amperes
The opposition to electron flow is
Resistance
The rate at which electrons do work is
Power or electrical power
The measurement of power in an electrical circuit is
Watt or kilowatt
______ is the BTU output of the equipment divided by the power input with a seasonal adjustment.
Seer (seasonal energy efficiency rating)
The mathematical relationship between the current electromotive force and resistance of electric circuit is known as
Ohms law
Which of the following is produced around a conductor when current flows through the conductor?
Magnetism
What are the results of clamping a clamp on ammeter around more than one conductor, specifically L1 and L2?
No reading
If a conductor was wrapped around the jaws of a clamp of an ammeter four times, the proper reading would be what if the meter was reading 16 amps
4 amps
When a circuit has a complete unbroken path, it is said to have
Continuity
The most popular conductor used in the HVAC industry is
Copper
The source of power must always be off when you’re reading ____
Resistance
Power from the thermostat to fan relay coil. What color is that?
Green
Power from the thermostat to the gas valve for our heating is what color
White
Power from the transformer to the thermostat is what color
Red
Power from the thermostat to the condensing unit relay or coil contactor is what color
Yellow
What is our line 1 voltage? High power color is
Black
What colors are ground for high power?
Green
What colors is line 2 voltage for high power?
Red
What color is neutral for high power?
White
Air conditioning equipment is designed to operate at a voltage of plus or minus what percent
10%
What would be the resistance of a circuit that is open?
Infinite
What would be the resistance of a motor winding that is shorted?
0
What’s be a resistance of a good motor?
20 ohms and 70 ohms (B & C)
