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Un consumator electric cu rezistenta
R= 280 ohm .
T=10 h
U = 220 w.
I = ?
W = ?

Răspuns :

CristianBarbu
I=U/R=0,78A
W=U•I•t=36 000 • 220 • 0,78 = 6,17MJ (Mega Joules)
Baiatul122001
U=IR=>I=U/R=220/280=0,78 A
W=R*I²*T
T=10 h=36000000 s
W=R*I²*T=280*0,78 ²*36000000=168*36000000=6048000000 J=6048 MJ