Question

What is the current in milliamperes produced by the solar cells of a pocket calculator through which 6.90 C of charge passes in 3.50 h?

Answer 1

1 Ampere is equal to 1 Coulomb per second.

Knowing this, let's first convert the given time from hours to seconds:

`3.5\text{ h}=3.5\cdot3600\text{ seconds}=12600\text{ seconds}`

Now, to calculate the current, let's divide the charge by the time:

`I=(6.90)/(12600)=0.000548\text{ A}=0.548\text{ mA}`

Therefore the current is 0.548 mA.