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Sebuah pemanggang roti disambungkan kepada bekalan elektrik 240V. Arus dalam pemanggang roti ialah 0.1A. Cari tenaga elektrik yang dibekalkan kepada pemanggang roti dalam 1 minit.
Beza keupayaan melintang suatu pemanas adalah 12V. Cari tenaga yang terbuang dalam pemanas tersebut apabila cas 2.0 C mengalir melaluinya.