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(1)オームの法則 電流=電圧/抵抗=6.0/2=3.0A
(2)電力=電圧☓電流=6.0☓3.0=18W
(3)熱量=電力☓時間(秒)=18☓( 60☓5 )=5400J
(4)(1)(2)と同様に考え、電力=6.0☓6.0/4=9W 電力が半分になったので、水温も半分の4℃上昇すると考えられる

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