I'd like to understand the dynamics of a galvanic cell in terms of fundamental physical principles, rather than the usual higher-level equilibrium chemistry explanation. Specifically, how do the states of the electrodes, solutions and salt bridge evolve in the time immediately after the external conductor is connected? For that matter, what processes, if any, are occurring in each half cell if both the salt bridge and external conductor are disconnected? I've been told that each electrode creates an electric field through the external conductor, which is opposed by the barrier at the end of the (disconnected) conductor. Is this accurate?