किसी द्विध्रुवीय संधि ट्रांजिस्टर में उत्सर्जक दक्षता (p-n-p ट्रांजिस्टर) है :
1
\(\rm \frac{Current \ of \ injected \ carriers \ at \ J_E}{total \ collector \ current}\)
2
\(\rm \frac{Current \ of \ injected \ carriers \ at \ J_E}{total \ emitter \ current}\)
3
\(\rm \frac{Current \ of \ injected \ carriers \ at \ J_C}{total \ collector \ current}\)
4
\(\rm \frac{Current \ of \ injected \ carriers \ at \ J_C}{total \ emitter \ current}\)