U = 1,5v
Koszt sieci - 0,8zł / 1kWh
Koszt bateri - 2,7zł / 3Ah
[tex]W = 3 \times 1.5 = 4.5Wh = 0.0045kWh[/tex]
[tex]0.0045kWh - 2.7zl \\ 1kWh - x \\ \\ x = \frac{1 \times 2.7}{0.0045} = 600zl[/tex]
[tex] \frac{600}{0.8} = 600 \div 0.8 = 600 \times \frac{10}{8} = \frac{6000}{8} = 750razy[/tex]