Question

Household current in a circuit cannot generally exceed 15 for safety reasons. What is the maximum amount of charge taht could flow through this circuit in a house during the course of a 24 hour day

Answer 1

The current I is defined as the amount of charge Q flowing through a certain point in a time t:
$I= \frac{Q}{t}$
which can be rewritten as 
$Q=It$
so, by using this formula we can calculate the maximum amount of charge that can flow in the circuit. In fact, the maximum current is I=15 A, while the time is
$t=24 h=86400 s$
so the maximum amount of charge is
$Q=(15 A)(86400 s)=1.30 \cdot 10^6 C$