Ammeter Design
电流表设计
Ammeters, as well as voltmeters and ohmmeters, are designed with the use of a sensitive current detector such as a galvanometer.
电流表、电压表和欧姆表都是利用灵敏电流检测器（如检流计）设计的。
An ammeter is placed in series with a circuit element to measure the electric current flow through it. The meter must be designed offer very little resistance to the current so that it does not appreciably change the circuit it is measuring. To accomplish this, a small resistor is placed in parallel with the galvanometer to shunt most of the current around the galvanometer. Its value is chosen so that when the design current flows through the meter it will deflect to its full-scale reading. A galvanometer full-scale current is very small: on the order of milliamperes.
电流表被串联到电路元件中以测量通过它的电流。仪表必须设计成对电流有极小的电阻，以便不显著改变它所测量的电路。为了实现这一点，一个小电阻被并联到检流计上，以将大部分电流绕过检流计。其值被选择使得当设计电流通过仪表时，指针会偏转到满量程。检流计的满量程电流非常小：大约是毫安级。
| Ammeter concept
安培计概念 | Moving coil meters
动圈式电流表 |
用于设计一个满量程电流为 I = 安的电流表，所需的分流电阻由下式给出
中文译文中的待填/计算数值依次对应：1：id 2：rs。实际数值以上方原输入框为准。
DC Circuits
索引：直流电路
| HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学 | R Nave |
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