Match each multimeter measurement setup or probe function on the left with its correct cir… — Armed Services Vocational Aptitude Battery (ASVAB)

Match each multimeter measurement setup or probe function on the left with its correct circuit connection requirement or terminal jack on the right.

Voltage measurement across an active componentConnected in parallel across the component under test
Current measurement through a circuit branchConnected in series by opening the circuit path
Current measurement input for loads greater than $400\text{ mA}$ Dedicated $10\text{ A}$ or high-current terminal jack
Standard return/negative reference probe connectionDedicated $\text{COM}$ (Common) terminal jack

Answer

Voltage measurement connects in parallel; current measurement connects in series; currents over

400\text{ mA}

use the

10\text{ A}

jack; and the reference probe connects to the

\text{COM}

jack.

Voltage measurements require parallel hookup across components because the meter measures potential difference with high impedance. Current measurements require breaking the circuit and inserting the meter in series so electron flow passes through its low-resistance shunt. High current draws require the dedicated

10\text{ A}

input jack to bypass the low-amperage fuse, while the black test lead consistently attaches to the common (

\text{COM}

) terminal.

Step-by-Step Solution

Identify the basic rules for measuring voltage versus current in an active circuit.

Voltage is measured across components in parallel, while current is measured through a conductor in series.

A voltmeter has high internal resistance and senses potential difference across two points; an ammeter has near-zero resistance and measures current flowing directly through it.

Identify the proper probe jack assignments for current levels and ground reference.

The black lead always goes to

\text{COM}

, and currents above standard milliampere limits require the heavy-duty

10\text{ A}

jack.

Using the low-current jack for loads over

400\text{ mA}

would overload and blow the internal fast-acting fuse.

Pair each configuration item with its corresponding rule or jack.

All four pairs are matched: Voltage with parallel connection, current with series connection, high current with

10\text{ A}

jack, and reference probe with

\text{COM}

jack.

Each multimeter mode requires specific lead placement and physical hookup to ensure measurement accuracy and operator safety.

Key Concept

Multimeter lead placement and circuit connection rules for voltage and current measurements

Estimated Time:45s

Question

Answer

Step-by-Step Solution

Key Concept

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