NCCER Electrical Certification Practice Test 2025 – Complete Exam Prep

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What is the typical range of voltage for a standard residential electrical outlet in the U.S.?

240 volts

120 volts

The typical voltage for a standard residential electrical outlet in the U.S. is 120 volts. This standard voltage is used for most household appliances and electronic devices, ensuring they can operate with the electrical system commonly provided in homes. In contrast to the other options, 240 volts and 220 volts are typically associated with larger appliances like dryers or ovens that require more power to operate efficiently. The figure of 110 volts is often mentioned, but it is more of a historical reference; modern outlets are regulated to provide 120 volts to accommodate today's electrical needs and equipment. This understanding is essential for anyone in the electrical field, ensuring they can safely and accurately work with residential wiring and appliances.

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220 volts

110 volts

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