Question

Cata energie electrica degaja un fier de calcat (cu tensiunea U=220V , intensitatea I=6A) in timp de 10 minute?
1 Calculati energia si in jouli si in Kwh
2 Calculati rezistenta electrica a fierului de calcat

Answer 1

Răspuns:

$1.\\\\W=UIt\\\\t=10*60=600 secunde\\\\ W=220*6*600=792.000J\\W=792000J=220*6:1000*0,16kwh=0,22kwh\\\\2.\\U=IR\\R=U:I=220:6=36,66 ohmi$