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.
