Odpowiedź:
1.
U = 4 V
Q = 55 C
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W ?
W = Q*U = 55C * 4V = 220 J
W = 220 J
2.
t = 1 h = 3600 s
I = 5 A
U = 3*4 V = 12 V
-------------------------
W ?
P = U*I = 12V * 5A = 60 W
W = P*t = 60W * 3600s = 216 000 J = 216 kJ
W = 216 kJ
3.
Q = 20 000 mAh
a)
1mA = 0,001 A
1h = 3600 s
Q = 20 000 mA * 1 h = 20 000 * 0,001A * 3600s = 72 000 C = 72 kC
Q = 72 kC
b)
I = 4*25mA = 100 mA
Q = I*t
t = Q/I = 20 000mAh/100mA = 200h
t= 200 h