The BC548 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.
The 2N-5886, 2N5886G NPN Transistor, 25A, 80V, 2-Pin TO-204AA Package Manufactured By ON Semiconductor. Features: Collector-Emitter Volt (Vceo): 80V Collector-Base
The 2SD1947, 2SD-1947, D1947, 1947 is a 100V 10A NPN Silicon Transistor, TO-220F Package , Applications High Gain current, low Uce Voltage Saturation, Integrated Diode, Manufactured By TOSHIBA.
This Power MOSFET is the latest development of STMicroelectronics unique “single feature size”™ strip-based process. The resulting transistor shows extremely high packing density for low on resistance.