Many stereo speaker cables are made of copper wire surrounded by rubber. The electricity travels down the copper portion of the cable while the rubber protects you from being "zapped" by the electricity. Which physical property explains the difference in ability of copper and rubber to transmit electricity?

Question

Many stereo speaker cables are made of copper wire surrounded by rubber. The electricity travels down the copper portion of the cable while the rubber protects you from being "zapped" by the electricity. Which physical property explains the difference in ability of copper and rubber to transmit electricity?

A.
density
B.
ductility
C.
color
D.
conductivity

Answer 1

The correct answer is D. conductivity.

Copper is a good conductor of electricity, meaning it allows electric current to flow through it easily. On the other hand, rubber is an insulator, which means it does not conduct electricity well, protecting you from electrical shocks.