Ch 1-2
The electrical energy supplied to an electrical circuit is called _____.
Electromotive force
You must understand the _____ in air-conditioning, heating, and refrigeration control and power systems to do an effective job of installing equipment.
Circuitry
The solenoid is considered a _____ because it consumes electricity to do useful work.
Load
The _____ is often used as a graphical representation of alternating current
Sine Wave
The smallest wire listed by the American Wire Gauge is number _____.
50
An electrical device that will open an electrical circuit, preventing current flow to the circuit if a small leak to ground is detected, is called a _____.
GFCI
The voltage drop of a series circuit is _____.
proportional to the resistance in that part of the circuit
A manually operated switch is a switch that is opened and closed by _____.
manual force
In most locations in the United States, the common frequency is _____ hertz.
60 Hz
A _____ is used to break the electrical power supply to a load.
Disconnect Switch
_____ is opposition to the flow of electrons in an electric circuit and is measured in ohms.
Resistance
Parallel circuits are common in the industry because most loads used operate from _____
line voltage
The _____ tells how, when, and why a system works as it does.
Schematic Diagram
The sum of the resistance and reactance in an AC circuit is called the _____.
Impedance
_____ hot legs are supplied to an appliance by a three-pole breaker.
3
A utility company calculates the power bill of its customers using _____.
Kilowatt-hours
If any switch that is connected in series with a load is open, the load will be _____
de-energized
A _____ relay is a relay that can open a control circuit and remain open until the occupant or service technician resets the thermostat or the power supply.
Lockout
Inductance in an AC circuit is an effect that is due to the magnetic fields caused by the _____.
Current Flow
A _____ can be checked for resetting if a voltage reading is taken between the ground and the breaker.
Breaker
The ampere draw of a 5,000-watt electric heater used on 120 volts is _____ amperes.
42
The use of parallel circuits enables the correct _____ to be supplied to the loads in the electrical circuitry of the equipment.
Voltage
The advantage of a pump-down cycle is that the refrigerant cannot _____ back to the crankcase, when the system cycles off.
Migrate
From a substation, the power is distributed to transformers that _____ the voltage to a usable voltage
Step-Down
A _____ is an array of electrical switches mounted in one panel that is used to distribute the correct voltage to the circuit.
breaker panel