器材选择的几点感悟

• 作 者: 张希禄 陈淑健
• 机 构: 山东省沂水县第一中学,
• 出 处: 理科考试研究
• 发表日期: 2013年23期
• 关键词: 器材选择 安特性曲线 实验器材 量程 高考 电压表 灯泡 电流表 电动势 电池组 天津 人眼 考题 感悟 电学 电键 导线 测绘 操作

电学实验器材的选择是一个重点、难点,有时令人眼花瞭乱、手足无措.结合2013年的高考题的分析,笔者有以下几点感悟.典例1(2013天津高考)9.(3)要测绘一个标有“3 V,0.6W”小灯泡的伏安特性曲线,灯泡两端的电压需要由,零逐渐增加到3 V,并便于操作.已选用的器材有:电池组(电动势为4.5 V,内阻约1Ω);电流表(量程为0~250 mA.内阻约5Ω);电压表(量程为0~3 V.内限约3 kΩ);电键一个、导线若干.

The choice of electrical experiment equipment is a key, difficult, and sometimes dazzling, at a loss.With the analysis of the entrance examination in 2013, the author has the following perceptions. Example 1 (2013 Tianjin Entrance Examination) 9. (3) to To plot the volt-ampere characteristic of a “3 V, 0.6W” small bulb, the voltage across the bulb needs to be gradually increased from zero to 3 V and is easy to handle. Selected equipment is: Battery pack (emf 4.5 V, internal resistance about 1Ω); ammeter (range of 0 ~ 250 mA. Internal resistance of about 5Ω); voltmeter (range of 0 ~ 3 V. The internal limit of about 3 kΩ); a key, a number of wires.