# What factors affect electrochemical cells?

##### 1 Answer

The Gibbs free energy change determines the voltage of an electrochemical cell. This in turn depends on factors such as concentration, gas pressure, and temperature.

#### Explanation:

**Gibbs Free Energy**

The Gibbs free energy measures how far a system is from equilibrium.

It therefore determines the voltage (driving force) of an electrochemical cell.

where

**Concentration and Gas Pressure**

For an equilibrium reaction such as

Therefore both **concentration** and **gas pressure** affect the voltage of the cell.

**Temperature**

According to the **Nernst Equation**,

The temperature term in this equation shows that temperature also affects the cell voltage.