# MCAT Physical : Batteries

## Example Questions

### Example Question #21 : Electrochemistry

Imagine a galvanic cell which uses solid zinc and aqueous iron ions to produce a voltage.

The cell above resulted in a transfer of 0.05mol of electrons. The cell ran for four minutes at a constant voltage. What is the current of the cell?

Explanation:

This problem requires us to use dimensional analysis in order to compare what we know, and arrive at the current of the cell. First, we start by noting that the unit for current is Coulombs per second, or . Next, we combine the details of the galvanic cell in order to arrive at the appropriate units, and determine the current.

### Example Question #2 : Batteries

The cell phone battery is acting as a galvanic cell because it is releasing voltage

The cell phone battery is acting as a galvanic cell because it is acquiring voltage

The cell phone battery is acting as an electrolytic cell because it is releasing voltage

The cell phone battery is acting as an electrolytic cell because it is acquiring voltage