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Un bec de 100W functioneaza in 3 ore.
a)Care este energia consumata in jouli si watti?(in jouli am facut dar in watt nush cum)
b)daca 1kw/ora energie electrica consumata costa 60 bani,cat costa energia consumata de bec>?
Repede urgenttttt

Răspuns :

Andreikzro
a)Se da puterea becului. P=100W si timpul de functionare t=3h=3×3600=10.800s
P=L/t ⇒E=L=P×t  ⇒L=100×10.800=1.080.000J=1080KJ=1,08MJ
E=P×t=100W×10800s=1.080.000Ws=1.080kWs=1.080/3600=0,3kWh
b)Daca un kWh (nu kW/h), costa 60 de bani, atunci 0,3kWh costa (regula de trei simpla):
0,3kWh×60bani/1kWh=18 bani