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焦耳定律是初中物理教学的一个非常重要的验证性演示实验,苏科版教材先后采用了两种实验方案,一是在两个串联的阻值不同的螺旋状电阻丝中间插一个火柴头,通过观察哪个火柴头先被点燃来比较电流通过电阻丝时产生热量的多少.但这个实验设计有不足之处,就是火柴头插在电阻丝中间只能吸收相邻几圈电阻丝产生的热量,
Joule’s law is a very important demonstrative demonstration experiment for junior high school physics teaching. The Suko version has adopted two experimental programs. One is to insert a match head between two series resistance wires with different resistance values. Observe which match head was ignited first to compare the amount of heat generated when the current passes through the resistance wire. However, this experimental design has the disadvantage that the match head inserted in the middle of the resistance wire can only absorb the heat generated by the adjacent resistance wires.