An electric appliance draws a current of $0.4\, A$ when the voltage is $200\, V$. Calculate the amount of charge flowing through it in one hour.

(1440 C) The formula for electric charge is $Q = I \times t$.
Given:
Current $(I)$ = $0.4\, A$
Time $(t)$ = $1\, \text{hour} = 60 \times 60\, s = 3600\, s$.
Substituting the values into the formula:
$Q = 0.4\, A \times 3600\, s$
$Q = 1440\, C$.
Therefore, the total charge flowing through the appliance is $1440\, C$.