Răspuns :
U=220 V
P=100 W
[tex]P= \frac{U^2}{R} [/tex]
[tex]R= \frac{U^2}{P}}= \frac{220^2}{100}= 484[/tex] ohmi.
P=100 W
[tex]P= \frac{U^2}{R} [/tex]
[tex]R= \frac{U^2}{P}}= \frac{220^2}{100}= 484[/tex] ohmi.