When one of the plates of an isolated capacitor is grounded, does the charge become zero on that plate or just the charge on the outer surface become zero? The charge on that plate becomes the same as the charge on Earth.
Suppose one plate of the capacitor is grounded which means there is charge present at only one plate. We know that the potential across the capacitor will be 0, i.e., V=0. And capacitance of the Capacitor will be C=Q/V C=Q/0 implying C=∞ So it means that the capacitance of a grounded capacitor is Infinite.
The capacitor is for EMI filtering, it is there to reduce common mode noise. Yes they are ground terminals. One is the ground reference for unisolated mains input side, the other one is the ground reference for isolated low voltage output side. Therefore it must be of special type for safety reasons, the type is called an Y capacitor.
A capacitor typically consists of an insulator with two metal plates attached on both sides of the insulator. Insulators do not conduct current. The insulator used in capacitors is called a dielectric. The positive and negative charges are transferred within the conductor during the flow of electricity.
No, the fact that one plate is grounded does not mean that there is no charge on that plate. Look up "charging by induction" which leaves a charge on a conductor even though it is grounded. What is your definition of capacitance if the two plates do not carry same amount of opposite charges?
Therefore, capacitors play the three following important roles in an electronic circuit. Capacitors can charge and discharge because of the structure. Featured by the electric charge and discharge, capacitors also can be used as a power supply. Camera flashes utilize this feature of capacitors.
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