(a) Explain why(i) metals are good conductors of electricity,(ii) insulators do not conduct electricity.[3] 相关知识点: 试题来源: 解析 (a) mark (i) and (ii) together:mention of free electrons(current is) flow/movement of free electronsinsulators contain no free electrons / metals contain...
Metals are good conductors of heat and electricity because they contain a glut of free electrons. These free electrons are able to move around freely and collide with one another, propagating heat and electricity through the metal. The majority of materials that conduct heat and electricity are m...
Why are metals good conductors of electric current? a. They possess high concentrations of protons. b. They possess low concentrations of protons. c. They possess high concentrations of free electrons Explain why nuclei that contain more than 82 protons are radioactive. ...
材料科学与工程基础作业讲评-7 第十次作业中文 4-12热处理（退火）的实质是什么？它对材料的拉伸强度、硬度、尺寸稳定性、冲击强度和断裂伸长率有什么影响？结构弛豫，非晶至结晶转变 4-20玻璃的理论强度超过7000MPa。一块平板玻璃在60MPa弯曲张力下破坏。我们假定裂纹尖端为氧离子尺寸（即裂纹尖端...
Why are metals and alloys used in so many materials? Why is stainless steel better than plastic as a utensil? Why does sound travel faster in lower density materials and in hotter materials? Why does plastic float? Why should heat loss be prevented, including the implications of not using su...
All Siltech Silver-Gold alloys (an alloy means a mix of two or more metals) do have positive aging. In other words, electrically, the wires improve over time, even when not playing music. Moreover, distortion reduces over the years, continuously improving sound quality. These special propertie...
Why are metals extremely good conductors of electricity?Because metals have large numbers of nonlocalized electrons.
While copper and silver are both more efficient electrical conductors than gold, that efficiency degrades as the connections tarnish and corrode. Gold connectors, however, do not tarnish or corrode. This makes gold the preferred choice for plating electrical connectors and in integrated circuits. ...
These materials are chosen due to their ability to meet the high-quality standards required for critical applications. The post-plating heat treatment process, when applied to these metals, ensures they deliver peak performance in their respective applications, extending the life and reliabili...
Metals are great thermal conductors, making them effective at transferring waste heat from a motor to the outside atmosphere. This is a valuable asset in high-powered or low-efficiency motors as both create large amounts of waste heat that need to be dispersed. ...