小刚用如图甲所示电路来探究电流与电压的关系,闭合开关S,将滑

小刚用如图甲所示电路来探究电流与电压的关系,闭合开关S,将滑动变阻器的滑片P从a端移至b端,电流表和电压表的示数变化关系如图乙所示,实验时,电源电压保持5V不变,当滑片P位于a端时,电阻R1在10min内产生的热量为___ J。

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