Capacitors in series: Capacitors in parallel:

Capacitors Consider two large metal plates which are parallel to each other and separated by a distance small compared with their width. Area A The field between plates is L

The capacitance is:

a b C1C1 C3C3 C5C5 C4C4 C2C2 C 1 =C 5 =8.4  F and C 2 =C 3 =C 4 =4.2  F The applied potential is V ab =220 V. a)What is the equivalent capacitance of the network between points a and b? b) Calculate the charge on each capacitor and the potential difference across each capacitor.

A BC D

Electric field near the surface of a conductor

Capacitors in series: Capacitors in parallel:

Most capacitors have a non-conducting material, or dielectric, between their conducting plates. When we insert an uncharged sheet of dielectric between the plates, experiments show that the potential difference decreases to a smaller value V (we did this experiment last class!). When the space between plates is completely filled by the dielectric, the ratio is called dielectric constant.

Moore’s Law (1965): every 2 years the number of transistors on a chip is doubled Smaller, Denser, Cheaper