Beginning of Essay
A device for storing an electrical charge is called a capacitor or electrical condenser. in their simplest form consist of two metal plates, which are separated by a nonconducting layer called the dielectric. As one plate gets charged with a direct- current such ....

Middle of Essay
.... charge with one-volt difference of potential. that use vacuum, air, or other gases are used in applications where values of capacitance required do not have to be large, but the energy loss in the dielectric must be very small. Some applications for these are in radio- frequency circuits and low- frequency measuring circuits where great precision is required. Another type of capacitor uses castor or mineral oil for the dielectric. Oil insulated are used in applications where larger values of the capacitance are required. also use solid dielectrics such as films of synthetic materials, paper, glass, and mica. Mica has excellent properties a ....