The current intensity is defined as the amount of charge Q that passes through a certain point of an electrical wire in a time interval of 
:
In our problem, the current intensity is
while the amount of charge that passes a certain point of the wire is
If we re-arrange the previous equation:
we can find the time needed for this amount of charge to pass through a point of the wire:
In our problem, the current intensity is
while the amount of charge that passes a certain point of the wire is
If we re-arrange the previous equation:
we can find the time needed for this amount of charge to pass through a point of the wire: