Ch 4 - Test and Measurement Instruments

watt-hour electric kilowatt-hour smart

The _________________________ meter measures the amount of electrical energy used by the dwelling electrical system.

DMM

The abbreviation for a digital multimeter is _____________.

milliammeter

The letters VOM are an abbreviation for volt, ohm, and __________.

polarity

The positive or negative direction of DC voltage and current is referred to as ____________________.

clamp-on

The two basic types of ammeters are 'in-line' and ____________________.

short circuit

When using an analog ohmmeter as a continuity tester, a reading of zero indicates a(n) _________________________.

Ohmmeter

Which of the following test instruments must be used only when the circuit in not energized?

Harmonics

__________ are frequencies that are multiples of the fundamental 60 Hertz frequency.

Non-linear loads

__________ are load types where the load impedance is not constant.

True RMS

__________ meters provide accurate measurements of AC values in environments where the basic AC waveform is distorted.

instructions

Always read and follow any operating __________ that come with a meter.

ohmmeter

An instrument used to measure values of resistance is called a(n) __________.

resistance

An ohmmeter is used to measure the ____________________ of a circuit or circuit component.

watts

Electrical power is measured in __________.

ammeter

Excessive current draw results in lower efficiency and wasted energy. An _______________ can be used to determine if an electrical load is drawing more current than necessary.

resistance ohms

A VOM can measure DC and AC voltages, DC and AC current, and ____________________.

solenoid type voltage tester

A Wiggy is an electrical trade name for a __________.

smart meter

A ________ measures electrical consumption in more detail than a conventional kWH meter and has the ability to communicate that information back to the local electric utility for monitoring and billing purposes.

continuity

A ________________ tester is a device used to indicate whether there is a continuous path for current to flow in an electrical circuit or electrical device.

open

A break in an electrical conductor or cable is called a(n) __________ circuit.

analog

A meter that uses a moving pointer or needle to indicate a value on a scale is called a(n) __________ meter

clamp meter

A relatively new type of test tool, often called a _______________, typically can measure alternating current amperage, both direct current and alternating current voltage, and resistance, which eliminates the need to carry around several separate test and measurement instruments.

voltage

A voltage tester indicates only approximate __________ measurements

parallel

A voltmeter is connected in ________________ with the circuit or component being tested.

voltage

A voltmeter is used to measure __________.

non-contact voltage tester

A(n) __________ can indicate that voltage is present on a circuit without actually being connected to the circuit.

ground resistance meter

A(n) __________ is used to determine the amount of resistance to the earth through a grounding electrode.

series

In-line ammeters are always connected in ______________ with the circuit or circuit component being tested.

electrical energy

Kilowatt-hour meters are used to measure __________.

energized

Never attach a continuity tester to a circuit that is __________.

energized

Never work on __________ electrical equipment unless it is absolutely necessary.

kilowatt

One __________________-hour is equal to one thousand watt-hours.

one million

One megohm is equal to __________ ohms.

clamp-on

A(n) ______________ ammeter surrounds the conductor, picks up the strength of the magnetic field that is set up around the conductor, and converts it into a proportional value of current.

ammeter

A(n) ____________________ is designed to measure the amount of current flowing in a circuit.

open circuit

A(n) _________________________ is a break in an electrical conductor or cable.

icon

A/an _______ is a symbol used on some electrical meters to indicate where a selector switch must be set so the meter can measure the correct type of electrical quantity.