Two valence electrons

Three valence electrons

Four valence electrons

Five valence electrons

U.S.A.

U.K.

U.A.E

Japan

Capacitor is used in it

It is used to compare two signals

Difference amplifier yields more than the direct couple amplifier

Frequency of difference amplifier remains flat from zero to high frequency

Orissa

Kerala

Maharashtra

Madhya Pradesh

Coal gas

Producer gas

Steam fiery gas

Oil gas