Odpowiedzi

2010-01-01T15:11:12+01:00
W=U*I*t
P=U*I
W=P*t
P=W/P
W=1kWh=1000Wh=1000W*3600s=3600000Ws
t+8h20min=8*3600+20*60=30000s
P=3600000Ws/30000s=1200W
P=U*I
U=I*R
P=I²*R
I²=P/R
I=√(P/R)=√(1200/120)=√10=3,16A
2010-01-01T17:35:08+01:00
T=8h 20min=30000s
E=UIt
U=IR
E=I²Rt
I²=E/Rt
I=√E/Rt
E=1kWh=3600000J
I=√3600000J:[120Ω×30000s]
I=√3600000J:3600000Ωs
I=√1A²
I=1A