Arizona Drivers Permit Practice Exam Guide

Why is it important to prevent ground loops in low voltage audio and video systems?

They can cause the system to draw excessive power They introduce low-frequency hum and interference into the signal They cause wires to physically overheat and melt They violate fire codes

Correct Answer:

They introduce low-frequency hum and interference into the signal

Explanation:

Ground loops occur when there are multiple paths to ground with different potentials. This difference creates a small current that manifests as an audible 60Hz hum or video interference.

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