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printr o rezistenta electrica de R=20 ohmi, in 5 minute trece o sarcina de 600 C. Ce lucru mecanic se efectueaza?

Răspuns :

R=20Ω

t=5min=300s

Q=600C

I=[tex]\frac{Q}{t}[/tex]

I=[tex]\frac{600}{300}[/tex] A

I=2A

I=[tex]\frac{U}{R}[/tex]

U=I×R

U=2×20 V

U=40V

L=Q×U

L=600×40 J

L=24000 J