In the construction of a stackedfoil mica capacitor how is t

In the construction of a stacked-foil mica capacitor, how is the plate area increased? What type of capacitor has the higher dielectric constant, mica or ceramic? Show how to connect an electrolytic capacitor across points A and B in Figure 9-60.

Solution

12. A capacitor is a electrical device which consists of 2 parallel plates separated by an insulating material called dielectric.stacked foil mica capacitors are made of alternate layers of metal foil and thin sheets of mica.silver mica are formed by stacking mica sheets with silver electrode material screened on them. The capacitance of a capacitor is directly propotional to surface area of plates and inversely proportional to distance between the plates.if capacitors are placed in parallel within a circuit because of area direct proportionality overall plate size becomes electrically larger as if they were one capacitor, so is the case here larger the value of capacitance large is plate area. mica capacitors have low voltage ratings compared to other material of same value and their construction uses stacked thin foil plates all isolated by the dielectric. To increase plate area every other plate is connected to its lead terminal and they are then sealed by molding or by dipping

13. ceramic capacitors are made by coating two sides of small porcelain with silver and are stacked together to make a capacitor. dielctric constant is the ratio of absolute permitivity of medium to absolute permitivity of vaccum and the typical dielectric constant of ceramic is 1200 and that of mica is 5. ceramic capacitors have large dielectric constant and are available so relatively high capacitances can be obtained in a small physical size. they exhibit large non linear changes in capacitance against temperature and they are even non polarised devices so they can be used as by pass capacitors