Question

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

Answer 1

R=20Ω

t=5min=300s

Q=600C

I=$\frac{Q}{t}$

I=$\frac{600}{300}$ A

I=2A

I=$\frac{U}{R}$

U=I×R

U=2×20 V

U=40V

L=Q×U

L=600×40 J

L=24000 J