Question

How long does it take a current of 0.5mA to deliver 15C of charge?

Answer 1

How long does it take a current of 0.5mA to deliver 15C of charge?

**Solution.**

$$I = 0.5mA = 0.5 \cdot 10^{-3}A, q = 15C;$$ $$t - ?$$

For a steady flow of charge through a surface, the current $I$ can be calculated with the following equation:

$$I = \frac{q}{t},$$

where $q$ is the electric charge transferred through the surface over a time $t$.

The time can be calculated with the equation:

$$t = \frac{q}{I}.$$ $$t = \frac{15C}{0.5 \cdot 10^{-3}A} = 3 \cdot 10^{4}s.$$

**Answer:** The time is $t = 3 \cdot 10^{4}s$.