请输入您要查询的字词:

 

单词 Wheatstone bridge
释义 Wheatstone bridge
An electrical circuit for measuring the value of a resistance. In the illustration,
R1
is a resistance of unknown value,
R2
is a fixed resistance of known value,
R3
and
R4
are variable resistances with known values. When no current flows between A and B the bridge is said to be balanced, the galvanometer registers no deflection, and
R1/R2 = R3/R4
.
R1
can therefore be calculated. The Wheatstone bridge is used in various forms. In the metre bridge , a wire 1 metre long of uniform resistance is attached to the top of a board alongside a metre rule. A sliding contact is run along the wire, which corresponds to
R3
and
R4
, until the galvanometer registers zero. Most practical forms use one or more rotary rheostats to provide the variation. The device was popularized though not invented by Sir Charles Wheatstone.

Wheatstone bridge
随便看

 

物理辞典收录了3346条物理词条,基本涵盖了常用物理知识及物理英语单词词组的翻译及用法,是物理学习的有利工具。

 

Copyright © 2000-2023 Newdu.com.com All Rights Reserved
更新时间:2025/6/23 18:52:06