【正文】 加熱電阻。造成這一現(xiàn)象的原因是____。（2）為進(jìn)一步研究直流電動(dòng)機(jī)，他測(cè)得通過(guò)當(dāng)電動(dòng)機(jī)兩端電壓為5V時(shí)，而當(dāng)電動(dòng)機(jī)兩端電壓為1V時(shí)，電動(dòng)機(jī)線圈不轉(zhuǎn)。（3）當(dāng)電動(dòng)機(jī)兩端電壓為5V，電動(dòng)機(jī)工作1min所消耗的電能為_(kāi)___J，其中轉(zhuǎn)化為機(jī)械能的是____J。（3） 通過(guò)比較第2,4次實(shí)驗(yàn)數(shù)據(jù)可知，液體吸收的熱量多少與液體的_________有關(guān)。其中R是定值電阻（1）電路中有一根導(dǎo)線的連接不適宜，需要改接，請(qǐng)?jiān)谶@根導(dǎo)線上打，并畫出改接的導(dǎo)線，閉合開(kāi)關(guān)前，應(yīng)將滑動(dòng)變阻器的滑片p移動(dòng)到最_____ 端（左/右）（2）閉合開(kāi)關(guān)，三次調(diào)節(jié)變阻器，得到表一中的數(shù)據(jù)，由這些數(shù)據(jù) ①可看出這是探究電流與 的關(guān)系 ②分析實(shí)驗(yàn)數(shù)據(jù)，可概括出結(jié)論： （3）在探究電流與另一個(gè)物理量的關(guān)系時(shí)，需要多次更換 ，并且每次更換后都要調(diào)節(jié)滑動(dòng)變阻器，使電壓表的示數(shù) （增大，減小或不變）（4）小明根據(jù)自己的想法設(shè)計(jì)了另一種實(shí)驗(yàn)電路（如圖乙所示），其中，MN是一根金屬電阻絲，Q是一個(gè)金屬夾，主要實(shí)驗(yàn)步驟是：現(xiàn)將Q移動(dòng)最左端，再調(diào)節(jié)滑動(dòng)變阻器，確保電流不超過(guò)電流表所用的量程，然后從左向右且有間隔的改變金屬夾的位置，得到表二中的數(shù)據(jù)，最后分析數(shù)據(jù)得出結(jié)論。裝置中除了R甲R(shí)乙外，其余條件均相同。（2）小靖提議利用該裝置改裝成“比較食用油和煤油的吸熱能力”的實(shí)驗(yàn)，若保持甲的器材不變時(shí)，他們除了把乙的煤油換成食用油外，還需要更換乙的 ，此外，為了能在通電一段時(shí)間后，通過(guò)比較兩溫度計(jì)示數(shù)的大小來(lái)比較食用油和煤油的吸熱能力，他們?cè)O(shè)計(jì)的實(shí)驗(yàn)必須滿足的條件有 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