Question

Sa se calculeze rezistenta electrica a unui cuptor care conectat la tensiunea de 220 V, consuma intr-o jumatate de ora o energie electrica de 4kWh

Answer 1

[tex]\tt Se~da:\\ \\ U=220V\\ \\ h=30min=1800s\\ \\ L=4kWh=14400000J\\ \\ R=?\Omega\\ \\ \\ Formule:\\ \\ L=P \times t\\ \\ L=\frac{U^{2}}{R}\times t\Rightarrow R=\frac{U^{2}\times t}{L}\\ \\ \\ Calcule:\\ \\ R=\frac{220 \times 1800}{14400000}=6,05\Omega [/tex]