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.