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Results tagged with electricity
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user 243488
The study of the presence and flow of electric charge. Charges, currents, fields, potentials.
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Can current flow through a capacitor submerged in electrolytes?
The minimum potential to split water is 1.23V this is called electrolysis. A reaction is happening at either electrode where $$
2 H2O(l) → O2(g) + 4 H+(aq) + 4e−$$ at the anode(positively charged …
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4
votes
What exactly happens when $\rm NaCl$ water conducts electricity?
To describe the diffusion, migration (under an electric field) and the convection of species we have the Nernst-Planck Equation:
$$ \frac{\partial c}{\partial t} = - \nabla \cdot J \quad | \quad J = - …
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Electrode potential
The theoretical voltage is given by the Nernst Equation
$$\Delta G=-nFE=-RT\ln K_\mathrm{eq}+RT\ln Q$$
E is the cell potential Keq is the equilibrium constant and Q is the reaction quotient(the ratio …
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1
vote
Accepted
Why do batteries need a loop to discharge?
In a battery and electrochemical cells we typically explain the phenomenon using reduction potentials (these can be gotten from a standard reduction potential table). The Gibbs free energy dictates wh …
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0
votes
Accepted
Electrochemistry heat generation
because the enthalpy is the heat of reaction only at constant temperature and pressure in the absence of non-pv work and in a closed system. In the case of a battery we are definitely not in the absen …
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0
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1
answer
82
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Electrochemistry heat generation
In electrochemistry the Nernst equation says Gibbs=-nFE and the reversible heat=TdS= T*partialE partialT * -nF but the Bernardi heat equation is q= I(Voc-V+TpartialE partialT) when we know that the he …
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