Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Muzvigadzirwa zvemagetsi, kuwana chiyero chekugona kwechikwata chemaviri-port (kazhinji amplifier) kuwedzera simba kana amplitude yechiratidzo kubva pakunopinda kusvika kune chiteshi chekubudisa nekuwedzera simba rakashandurwa kubva kune imwe simba rekugovera chiratidzo. Inowanzotsanangurwa sechiyero chepakati chechiratidzo kana simba pachiteshi chekuburitsa kune iyo amplitude kana simba pachiteshi chekupinda. Kazhinji inoratidzwa uchishandisa logarithmic decibel (dB) zviyero ("dB kuwana"). Kuwedzera kukuru kupfuura imwe (yakakura kudarika zero dB), ndiko kuwedzera, ndiko kunotsanangura chivakwa chechinhu chinoshanda kana dunhu, nepo dunhu risingabatsiri richava nekuwedzera kushoma pane imwe. Izwi rekuti kuwedzera chete harina kujeka, uye rinogona kureva chiyero cheiyo inobuda kune yekuisa voltage (voltage gain), yazvino (yazvino kuwana) kana magetsi emagetsi (simba kuwana). Mumunda weaudio uye general purpose amplifiers, kunyanya operational amplifiers, izwi racho rinowanzoreva voltage gain, asi mu radio frequency amplifiers rinowanzoreva simba rekuwana. Uyezve, izwi rokuti gain rinoshandiswawo mumasisitimu akadai semasensors apo kuiswa uye kubuda kune zvikamu zvakasiyana; muzviitiko zvakadaro zvikamu zvekuwedzera zvinofanira kutsanangurwa, se "5 microvolts per photon" yekupindura kwephotosensor. The "kuwana" ane bipolar transistor kazhinji rinoreva mberi kuitika kuchinjirwa reshiyo, kana hFE ("beta", ari kunofambira mberi reshiyo Ic rakakamurwa Ib pane imwe kushanda pfungwa), kana dzimwe nguva hfe (duku-chiratidzo kuitika kuwana, pakona girafu Ic pamusoro Ib pane imwe nguva).  Mubvunzo: Chii chinomirira hFE?
"beta", static ratio yeIc yakakamurwa neIb pane imwe nzvimbo yekushanda