6- What is the current efficiency of a nickel-plating bath if the cathode of a copper coulometer in series with the experimental cell was found to have gained 1.025g and the weight of nickel deposited was 0.905g ? 1 6- What is the current efficiency of a nickel-plating bath if the cathode of a copper coulometer in series with the experimental cell was found to have gained 1.025g and the weight of nickel deposited was 0.905g ? 1