Question

A current of 1.8 A delivers 2.5 C of charge. How much time was required?

Answer 1

Answer: C

Explanation:

Answer 2

The current is defined as the amount of charge that flows through a given point in a certain time interval:
$I= \frac{Q}{\Delta t}$
where Q is the charge and $\Delta t$ the time interval.

In our problem, I=1.8 A and Q=2.5 C, therefore we can find the time interval by re-arranging the previous formula and plugging these numbers into it:
$\Delta t= \frac{Q}{I}= \frac{2.5 C}{1.8 A}=1.4 s$

Therefore, C) is the correct answer.