I_1=6A \quad \Delta t_1 = 10 min = 600s \quad I_2=1mA = 0,001 A
\Delta Q = ? \quad \Delta t_2 = ?
I= \frac{\Delta Q}{\Delta t} \Rightarrow \Delta Q = I \cdot \Delta t
\Delta Q = 6 \cdot 600 = 3600 \quad \left[ A\cdot s = C \right ]
I= \frac{\Delta Q}{\Delta t} \Rightarrow \Delta t = \frac{\Delta Q}{I}
\Delta t = \frac{3600}{0,001}= 3600000 \quad \left [\frac{C}{A}=\frac{\frac{A}{s}}{A}=s\right ]
R = 30 \Omega \quad U = 240V
I = ? \quad P = ?
U = RI \Rightarrow I = \frac{U}{R}
I = \frac{240}{30} = 8 \left[\frac{V}{\Omega }=\frac{V}{\frac{V}{A}}= A\right ]
P = I \cdot U
P = 8 \cdot 240 = 1920 \left [ A\cdot V = W \right ]