交流电表的示数一定是有效值吗?——由一道模拟题联想到的实验探究  

Is the display of alternating current meter effective value?——experimental exploring aroused by a simulation question

作　　者：黄正玉 

机构地区：[1]深圳市第二实验学校,广东深圳518021

出　　处：《物理实验》2013年第9期20-22,共3页Physics Experimentation

摘　　要：由一道模拟题引发了关于交流电表示数的实验探究,经理论和实验研究发现:磁电式交流电流表对完整正弦式电流进行测量时,其示数才显示有效值;对恒定电流和半波直流进行测量,其示数不是有效值.The experimental exploring aroused by a simulation question was carried out. It was found that when measuring complete sinusoidal current, the display of magnetic alternating current meter was effective value; when measuring steady current or half-wave direct current, the display of magnetic alternating current ammeter was not effective value.

关 键 词：交流电 电流表 电压表 有效值 

分 类 号：G633.7[文化科学—教育学]