How many instruments (voltmeters and ammeters) are installed correctly?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

How many instruments (voltmeters and ammeters) are installed correctly?

Explanation:
Voltmeter and ammeter must be wired in opposite ways to measure what you intend. A voltmeter should be connected in parallel with the component or section you’re measuring, and it has a very high input resistance so it draws almost no current and doesn’t change the circuit. An ammeter, on the other hand, must be placed in series with the load, and it should have very low resistance so it doesn’t drop a noticeable voltage or divert current away from the circuit. In the given diagram, two instruments follow these correct practices: one is connected across the element to measure voltage, and the other is placed in series with the circuit to measure current. The others are not wired in the proper fashion, such as a voltmeter placed in series or across the wrong part of the circuit, or an ammeter connected in parallel, which would distort readings or even short parts of the circuit. Therefore, two instruments are installed correctly.

Voltmeter and ammeter must be wired in opposite ways to measure what you intend. A voltmeter should be connected in parallel with the component or section you’re measuring, and it has a very high input resistance so it draws almost no current and doesn’t change the circuit. An ammeter, on the other hand, must be placed in series with the load, and it should have very low resistance so it doesn’t drop a noticeable voltage or divert current away from the circuit.

In the given diagram, two instruments follow these correct practices: one is connected across the element to measure voltage, and the other is placed in series with the circuit to measure current. The others are not wired in the proper fashion, such as a voltmeter placed in series or across the wrong part of the circuit, or an ammeter connected in parallel, which would distort readings or even short parts of the circuit.

Therefore, two instruments are installed correctly.

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