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dit : w ...?
jawab :
w = p.t
= 40 w x 2h
= 80 wh
W = usaha / energi, satuan joule
P = daya, satuan watt
t = waktu, satuan second
2 jam = 7200 second
W = 40 x 7200
W = 288000 joule
W = 288 kJ
Jadi energi yang diserap lampu adalah 288 kiloJoule
Jika jawaban cukup membantu ... boleh dong jadikan jawaban terbaik ?