Current strength is short for current and refers to the amount of electricity passing through the cross section of a conductor per unit of time. The units are amperes or an (A) for short.

no brass is copper and zinc alloy plating bronze is copper and tin alloy plating.

the main factors that control the thickness of electroplating layer are current density current efficiency and electroplating time.

Although the heating of the hanger is related to the temperature of the solution the main reason is: (1) the current passing through the hanger is too large. (2) poor contact on the hanger and high resistance makes the hanger hot.