An electric current can be produced by ___. A. a magnet B. a battery C. a piece of wood D. a plastic cup 相关知识点: 试题来源: 解析 B。电流可以由电池产生。选项 A 磁铁不能产生电流;选项 C 一块木头和选项 D 一个塑料杯都是绝缘体,不能产生电流。本题涉及物理知识点是电流的产生,...
A magnetic field is produced by ___. A. an electric current B. a piece of paper C. a book D. a pen 相关知识点: 试题来源: 解析 A。磁场是由电流产生的。选项 B 一张纸、选项 C 一本书和选项 D 一支笔都不能产生磁场。本题涉及物理知识点是磁场的产生,英语知识点是物品名称的表达。反馈...
Direct current is produced by by such sources as batteries, thermocouples, solar cells and commutator-type electric machines. Direct current not only can flow through wire but an also flow semiconductors. Direct current can be obtained from alternating current by use of arectifier. The first commer...
In order that an electric current can be produced in a conductor, an electric field must be built in it.的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,以提高学习效率,
On vibrations produced by an electric currentLXXLXXLXX
In an electric motor, the force that makes the rotor turn is produced by _. A. the magnetic field B. the electric current only C. the mechanical force D. the heat 相关知识点: 试题来源: 解析 A。解析:在电动机中,使转子转动的力是由磁场产生的。B选项仅电流不能使转子转动;C选项机械力不...
as high as the house current in China D. stored in the water where it lives 4. From this shot passage we can infer ___. [ ] A. the shorter an eel is, the stronger electricity it produces B. we can always feel the electricity produced by living cells C. human beings get their...
Electrical current is created when charged particles flow when a voltage is applied. In general, the charged particles that flow are electrons or ions.Answer and Explanation: Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts ...
Compact fluorescent lamps (CFLs) were produced as a persuasive substitute for fluorescent tube lights. The inner glass wall of a fluorescent lamp is generally coated with thin phosphor and is filled with mercury vapor at low pressure, which emits ultraviolet (UV) light. When current is passed th...
Direct current is produced by sources such as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire but can also flow through semiconductors,insulators, or even through a vacuum as in electron or ...