如圖19是小明探究電流產(chǎn)生的熱量與哪些因素有關(guān)的裝置：在兩個(gè)相同的燒瓶中裝有質(zhì)量___▲____（選填“相等”或“不等”）的同種液體，瓶中各放置一根電阻絲，且R甲大于R乙，這樣的裝置可以研究電流產(chǎn)生的熱量與_ _▲____的關(guān)系；實(shí)驗(yàn)中通過(guò)觀察______▲_______來(lái)比較電阻絲發(fā)熱量的多少；如果所用液體僅有水或煤油，為使實(shí)驗(yàn)現(xiàn)象明顯些，應(yīng)選擇___  ▲______來(lái)進(jìn)行實(shí)驗(yàn)。
相等，電阻，溫度計(jì)溫度的變化，煤油解析:
略
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