Jawabanmu

2014-02-21T05:39:13+07:00
W = P . t
    = 80 Watt . 1,5 (3600) sekon
    = 80 Watt . 5400 sekon
    = 432000 J
    = 432 kJ
2014-02-21T05:59:25+07:00
1,5 jam itu = 90 menit x 60 =5400 detik x 80 watt= 43200 joule = 43,2 kiloJoule