Question

1. Where is the energy stored in a capacitor? Why is it necessary to hook capicitor up to a source of emf (like a battery) in order for it to become charged? When answering, think back to the lesson of electrostatic energy.

Answer 1

Ans:-

A capacitor is also a storage device for electrostatic energy, and it is usually made up of two plates separated by a thin insulating material or dielectric. When connected to an energy source, electrons move to the surface of the negative plate and repel the electrons away from the surface of the positive plate. The energy is stored in the electric field created by the separation of charges between the two plates. The dielectric causes the electric field to be reduced for the same amount of charge. Since the field cannot change because the voltage is constant, more charge has to flow to the plates.

A battery is a storage device for chemical energy, and it is usually made up of two electrodes of dissimilar metals and immersed in a solution. It converts the chemical free energy derived from the redox reactions at the two electrodes into electrical energy resulting in a potential difference. This is the difference (also called EMF) drives the transport of electrons through an external wire.

When capacitor need energy to outside for all that things then it is used battery for electrical energy