Voltage
What is Voltage?
Voltage (electric potential difference) is the work done per unit charge in moving an electric charge between two points in an electric field, measured in volts (V = J/C). In electrochemistry, the cell voltage (electromotive force, emf) of a galvanic cell is the difference in electrode potentials between the cathode and anode: E_cell = E_cathode − E_anode. Cell voltage is related to the Gibbs free energy change by ΔG = −nFE, where n is the number of moles of electrons transferred and F is the Faraday constant.
Key Facts
Frequently Asked Questions
Voltage (electric potential difference) is the work done per unit charge in moving an electric charge between two points in an electric field, measured in volts (V = J/C). In electrochemistry, the cell voltage (electromotive force, emf) of a galvanic cell is the difference in electrode potentials between the cathode and anode: E_cell = E_cathode − E_anode. Cell voltage is related to the Gibbs free energy change by ΔG = −nFE, where n is the number of moles of electrons transferred and F is the Faraday constant.