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1.7 Electrical Resistance

1.7 Electrical Resistance

练习题

Based on the relationship between electrical conductivity and electrical resistance, which material from the following list would offer the lowest electrical resistance to current flow?

A. Aluminum

B. Copper

C. Silver

D. Gold

Which of the following statements correctly describe the relationship between atomic structure and electrical resistance? Select all that apply.

A. Materials with incomplete outer electron shells tend to have lower electrical resistance

B. The more tightly electrons are bound to the nucleus, the higher the electrical resistance

C. Valence electrons in far orbitals contribute to lower resistance because they are less bound to the nucleus

D. Insulators have high resistance because their atoms hold tightly to electrons in complete outer shells

E. All materials have the same electrical resistance regardless of atomic structure

When an electric current flows through a conductor, the electrical resistance opposes the flow of electrons, while conventional current is defined as flowing in the opposite direction to the electron flow.

The fact that different elements have different characteristics of electrical conductivity as well as electrical ___ is directly related to their atomic structure, particularly how easily valence electrons can be released from the atom.

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