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题目:有一个白炽灯泡标有“6V 12W”字样,将它与电阻箱及电流表串联起来接在电源上,调节电阻箱使其阻值减小6欧姆时,看到电流表的示数增大了0.5安培,此时灯泡正常发光,求此时电路消耗的总功率是多大?(设电源电压保持不变且不考虑温度对导体电阻的影响) (1998,天津市中考题) 这是一道综合性试题,下面从不同角度去分析、探索,从而引出多种解法。 要分清电阻箱阻值变化前后的两种情况,由题中叙述可知一种情况是电阻箱的阻值减小
Title: There is an incandescent bulb labeled “6V 12W”. Connect it to the resistance box and ammeter in series and connect it to the power supply. When the resistance box is adjusted to reduce the resistance value by 6 ohms, the current meter is increased. 0.5 ampere, when the light bulb is emitting normally, what is the total power consumed by the circuit at this time? (Set the power supply voltage to be constant and do not consider the influence of temperature on the conductor resistance) (1998, Tianjin exam) This is a comprehensive The questions are analyzed and explored from different perspectives, leading to multiple solutions. To distinguish between the two cases before and after the resistance box resistance changes, it can be seen from the title that one case is that the resistance box resistance decreases.