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weak constraint in" benchmark model of ccp"

Hi ,guys. I am confused by the use of weak constraint in model library ”Benchmark model of a capacitively coupled plasma" .more specific I don't understand why "J_total= intop1(-d(V_lm,t))" ,ie the total current density equals the time derivative of the Lagrange multiplier of electric potential.
Could you guys tell me what indeed "V_lm" is and how it relates to the total current density at the driven electrode? Thanks a lot!Image may be NSFW.
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