Bennett Mechanical Comprehension Practice Test 2025 - Free Practice Questions and Review Guide

The instrument specifically designed to measure electric charge is a coulometer. A coulometer works by measuring the amount of electric charge that is passed through a solution during electrolysis, which is inherently connected to the concept of charge in electrochemistry.

This device is essential in applications where monitoring the quantity of charge is crucial, such as in battery testing and charge balance assessments in electrochemical cells. The measurement is typically expressed in coulombs, which directly relates to the fundamental unit of electric charge in the International System of Units (SI).

While other instruments like the voltmeter, ammeter, and ohmmeter are important in the realm of electricity, they are meant for measuring different characteristics: a voltmeter measures voltage (electric potential), an ammeter measures current (the flow of electric charge), and an ohmmeter measures resistance. None of these directly quantify electric charge itself, which is the primary functionality of a coulometer. Thus, the correct choice is clearly the coulometer, as it serves the specific purpose of charging measurement.