ARRL Technician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 470

Which of the following is a good electrical conductor?

Aluminum

Copper

Copper is widely recognized as an excellent electrical conductor, making it a preferred material in electrical wiring and components. Its high conductivity means that it can efficiently transmit electrical current with minimal resistance, which is essential for a variety of applications, including residential, commercial, and industrial electrical systems. This property allows for reduced energy loss in the form of heat, ensuring that devices receive the intended amount of power effectively.

While aluminum is also a good conductor and is used in some applications, it does not outperform copper in terms of conductivity. Plastic and wood, on the other hand, are insulators; they resist the flow of electricity and are used for protecting conductive materials rather than conducting electrical current. Hence, copper stands out as the most effective option among the choices provided.

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Plastic

Wood

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