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历届高二《物理》教材讲解自感现象时,都有如图1所示的演示实验(这里我们不妨称之为“断电自感”实验).学生们对开关S断开瞬间灯泡A发出“更亮的闪光”后才熄灭的现象都留有深刻的印象,记忆犹新.这“更亮的一闪”鲜明地表现了电路中线圈L所起的作用.然而不少青年教师在按图1所示的电路自制教具时,往往实验“不成功”,看不到灯泡A猛然一亮的现象.
Each previous high school “Physics” teaching materials to explain the phenomenon of self-inductance, there is a demonstration experiment as shown in Figure 1 (here we may call it “power off self-inductance” experiment). Students on the moment switch S disconnected light bulb A issued “More The phenomenon of extinguishment after the bright flashes left a deep impression. The memory is still fresh. This “brighter flash” clearly shows the role of the coil L in the circuit. However, many young teachers are The self-made teaching aids shown in the circuit are often tested as ”unsuccessful" and do not see the phenomenon of the light bulb A suddenly lighting up.