An electrician is preparing to measure the supply voltage at a standard 120\text{ V} resid… — Armed Services Vocational Aptitude Battery (ASVAB)

An electrician is preparing to measure the supply voltage at a standard $120\text{ V}$ residential wall receptacle using a digital multimeter. Which meter function setting and lead placement must be selected to take this measurement safely and accurately?

A
Set the selector dial to DC Voltage ( $\text{V}=/\text{DCV}$ ) and connect the test leads in parallel across the receptacle terminals
Set the selector dial to AC Voltage ( $\text{V}\sim/\text{ACV}$ ) and connect the test leads in parallel across the receptacle terminalsCevap
C
Set the selector dial to AC Current ( $\text{A}\sim/\text{ACA}$ ), insert the red lead into the 10A jack, and insert the leads directly into the receptacle slots
D
Set the selector dial to Resistance ( $\Omega$ ) and insert the test leads directly into the energized receptacle slots

Cevap

Set the selector dial to AC Voltage (

\text{V}\sim/\text{ACV}

) and connect the test leads in parallel across the receptacle terminals

Measuring voltage requires placing the multimeter leads in parallel across the potential difference of interest (the receptacle terminals) while setting the selector dial to the corresponding waveform type, which is AC Voltage (

\text{V}\sim

) for residential mains power.

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Identify the power source type and measurement parameter

Residential outlets deliver alternating current (AC) at a nominal potential difference of

120\text{ V RMS}

, requiring the AC voltage function.

Multimeters have separate internal processing modes for direct current (DC) and alternating current (AC).

Determine the proper probe connection topology for voltage measurement

Connect the black lead to COM, red lead to

\text{V}/\Omega

, and place the probes across (in parallel with) the hot and neutral terminals.

A voltmeter possesses very high internal input impedance (typically

\ge 10\text{ M}\Omega

) and must be placed in parallel across the two points of potential difference without drawing significant current.

Anahtar Kavram

Multimeter Configuration for AC Voltage Measurement

Tahmini Süre:45s

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