[" 74.When NPN transistor is "2100" s an ampirier "2" ) holes move from emiter to base "],[" "I pleetrons move from base to collector "4" ) holes move from base of "100Omega" and an output "],[" 3) "clectrons move from collector to boltage gain of "50," an input impedance of "100Omega" and an "],[" A common emiter amplifier has a voltafe gamplifier is "],[" impedance of "200Omega" .The power bain of the amplifer is "],[[" 1) "500," (i "-1,000," 3) "1250," 4) "100]]