Electricity Calculator for a Galvanic Cell

Inserisci i dati per calcolare l’energia elettrica generata da una cella galvanica:


Inserisci il potenziale di cella calcolato o misurato (E).

Numero di moli di elettroni trasferiti nella reazione redox bilanciata.

The Electrical Energy Calculator of a Galvanic Cell allows you to determine the Gibbs free energy (ΔG) associated with the operation of an electrochemical cell, using the cell potential (E) and the number of electrons exchanged in the reaction. This calculation provides the amount of available or required electrical energy during a redox reaction.

The app is designed for students, teachers, and researchers studying electrochemical phenomena and wishing to better understand the relationship between electric potential, energy, and the spontaneity of reactions.

How it Works

The user must input:

  • Cell potential (E) – expressed in volts, can be obtained experimentally or calculated using the Nernst equation;
  • Number of exchanged electrons (n) – derived from the balanced redox equation.

The calculator applies the fundamental formula of electrochemical thermodynamics:

ΔG = – n × F × E

where:

  • ΔG = change in free energy (in joules or kJ/mol);
  • n = number of moles of exchanged electrons;
  • F = Faraday constant (96485 C/mol);
  • E = cell potential (in volts).

Interpreting the Results

  • ΔG < 0 → spontaneous reaction, the galvanic cell produces electrical energy;
  • ΔG > 0 → non-spontaneous reaction, external energy is required (electrolytic cell);
  • ΔG = 0 → electrochemical equilibrium, no net current produced.

Why It Is Useful

This calculator is an essential tool for:

  • Determining the electrical energy produced by a cell or battery;
  • Verifying the spontaneity of redox reactions by analyzing the sign of ΔG;
  • Studying the thermodynamic efficiency of galvanic cells and fuel cells;
  • Applying the relationship between chemical energy and electrical work in real systems.

The calculated energy represents the maximum amount of electrical work obtainable (or required) to carry out a chemical reaction in an electrochemical system.

Additional Tools

The result is displayed in a clear and readable container, with the option to copy the data for insertion into laboratory reports or academic exercises. The app serves as a practical support for understanding the relationship between electric potential, free energy, and the spontaneity of chemical reactions.