Jawaban:

Pembahasan

Untuk menyelesaikan soal ini kita gunakan rumus energi listrik :

Energi space listrik equals daya space listrik cross times waktu

Lampu pijar 40 W menyala 5 jam setiap hari selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 40 space straight W close parentheses open parentheses 5 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 6 space kWh end cell end table

Lima lampu jadi 30 kWh.

Setrika listrik 350 W menyala 6 jam selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 350 space straight W close parentheses open parentheses 6 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 63 space kWh end cell end table

TV 150 W menyala 6 jam setiap harinya selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 150 space straight W close parentheses open parentheses 6 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 27 space kWh end cell end table

Radio 30 W digunakan 2 jam setiap harinya selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 30 space straight W close parentheses open parentheses 2 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 1 comma 8 space kWh end cell end table

Pompa air 125 W dipakai 4 jam setiap harinya selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 125 space straight W close parentheses open parentheses 4 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 15 space kWh end cell end table

Kulkas 120 W dipakai sepanjang hari selama 1 bulan

table attributes columnalign right center left columnspacing 0px end attributes row E equals cell open parentheses 120 space straight W close parentheses open parentheses 24 space jam close parentheses open parentheses 30 close parentheses end cell row blank equals cell 86 comma 4 space kWh end cell end table

Total energi listrik selama 1 bulan :

table attributes columnalign right center left columnspacing 0px end attributes row cell E subscript t o t a l end subscript end cell equals cell 30 plus 63 plus 27 plus 1 comma 8 plus 15 plus 86 comma 4 end cell row blank equals cell 223 comma 2 space kWh end cell end table

Biaya total selama 1 bulan :

table attributes columnalign right center left columnspacing 0px end attributes row cell B i a y a end cell equals cell E subscript t o t a l end subscript cross times 1.000 end cell row blank equals cell 223 comma 2 cross times 1.000 end cell row blank equals cell 223.200 space rupiah end cell end table

Jadi, biaya listrik selama satu bulan sebesar 223.200 rupiah.

Penjelasan: