Nate Electrical Practice Exam 2025 - Free Electrical Practice Questions and Study Guide

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What is the primary function of a transformer?

To convert AC to DC

To increase or decrease AC voltages

The primary function of a transformer is to increase or decrease alternating current (AC) voltages. Transformers operate on the principle of electromagnetic induction, allowing them to change the voltage level while keeping the frequency constant. This process is essential in electrical systems for efficient power distribution, as it enables the transmission of electricity over long distances at high voltages, which reduces energy loss due to resistance in the wires.

By stepping up the voltage for transmission, transformers allow for decreased current flow, which significantly minimizes heat loss in the conductors. Conversely, transformers can also step down voltage levels to provide the appropriate supply for residential or industrial use. This versatility in adjusting voltage without altering the frequency is essential for various applications in electrical engineering and power management.

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To regulate current in a circuit

To ensure safety in electrical installations

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