Chapter 3 HVAC Level 1
2 circuits
A DPDT switch can control ________
Multimeter
A _____ is a test meter able to read voltage, current, and resistance
DC Voltage
A battery is a common source of _____
Ohmmeter
A continuity tester operates like an
Motor starter
A control device that opens a motor control circuit, which in turn opens a motor power circuit, is known as a ______ device
Solenoid coil
A device that acts as an electromagnet to open or close a valve is a ______
Rectifier
A device that converts AC voltage into DC voltage is a ______
Transformer
A device with two or more coils of wire wrapped around a common core is a _______
Slow blow fuse
A fuse with a time delay is known aas a _____
Pilot duty
A magnetic switching device that usually has overload protection and is used to control the power to motors is a _______
Relay
A magnetically operated switching device used in low current circuits is the _____
Conductor
A material that readily carries electricity is a _____
Analog meter
A meter that uses a needle to indicate a value is _______
Thermistor
A semiconductor device that changes resistance as the result of a change in temperature is called a _____
Raise and lower voltage
A transformer is used to ________
Insulator
An _____ is a material that impedes the flow of current. It is the opposite of a conductor
Ammeter
An _____ is used to measure current
Load
An electrical device that converts electrical energy from one form to another, such as heat or motion, is called a _____
Solenoid coil
An electromagnetic coil used to open or otherwise move a mechanical device is called a ________
Continuity
An unbroken circuit path has _____
Volt ohm meter
Another name for a multimeter is ______
240 Volts
Central air conditioning systems in homes generally require a power source of _______
Amperes
Current is measured in _______
Watts
Electrical power consumption is measured in _______
Voltage
Electromotive force is another name for _______
How much current they can withstand
Fuses are rated on the basis of ______
12.5A
How much current is drawn by a 120V circuit containing a 1,500W load?
0.8A
How much current will be drawn by a 120V series circuit containing a 100 ohm and a 50 ohm load?
324W
How much power is consumed by a 120V parallel circuit that contains a 100 ohm load and an 80 ohm load and draws 2.7A?
2160 watts
How much power is consumed by a circuit with a 120V source that draws 18A through a resistive load?
Parallel circuit
If a circuit containing five 50-ohm resistors has a total resistance of 10 ohms, the circuit is a ______
AC
If the electricity changes direction on a cyclical basis, it is known as ______
Parallel
In which type of circuit will a voltmeter read the same voltage when it is placed across the different loads?
1/1000th of an amp
One milliamp is equal to _______
An inaccurate reading
Placing the jaws of a clamp-on ammeter around two separate conductors will result in _______
Direct current
Resistance in a DC circuit is measured in _____
Ampere
The _____ is the unit of measure for current flow in an electrical circuit
Power
The amount of electrical energy used by an electrical load device is called ______
Wiring diagram
The colors of the wires in an electrical circuit are usually shown on the ______
Clampon meter
The device used to sense current using jaws that are clamped around a conductor is the _____
Voltage
The force that causes electrons to flow is most commonly called ______
Contactor
The magnetic control device used for switching higher-current circuits is the ______
Resistance
The opposition to the flow of electricity is called ______
The amount of current that flows through the body
The outcome of electrical shock is based on ________
Explain the abbreviations used on the diagram
The purpose of a legend on a circuit diagram is to _____
Current
The rate at which electrons flow in a circuit is known as _____
Inline ammeter
The type of ammeter that is placed in series with the load is the ______
Inductive
The type of electrical devices that draw significantly more current on startup or when first energized are those that are _______
Ladder diagram
The type of electrical diagram in which the loads are arranged between vertical lines is known as a ________
Volt
The unit of measurement for voltage is the _____
Extreme pain and possible death
The worst effect a current of 150 mA is likely to have on the human body is _____
They usually require more current when they operate
What characteristic do devices that use DC instead of AC power often have in common?
Electromagnet
When a current flows through a coil of wire wrapped around an iron core, a _____ can be created
Line Duty
When a protective device is in series with the load, it is known as a _________ device
Short circuit
When the current flow bypasses a load, it is called a _______
Electric heater
Which of these components is considered a load?
True
Wrapping a conductor several times around the jaws of the ammeter multiplies the current by the number of wraps.