How Does A Transistor Work?

For normal operation of a transistor the emitter- base junction is connected in forward biased and base-collector junction is connected in reverse biased direction. The voltage of the battery connected in reverse biased is greater than the voltage of the battery connected in forward biased direction. In forward biasing the emitter base junction repels electrons from the emitter region into the base region. As the width of the base is small so a large number of electrons are transferred to the collector. Only few electrons entering the base region recombine with the holes giving rise to a small base to emitter current. The electrons in collector are attracted by the battery of higher voltage. In this way current flows in transistor.