Chart comparing Bi-polar transistors and MOSFETS. NPN Transistors behave similarly to N-Channel MOSFETS. PNP Transistors are comparable to P-Channel MOSFETS. Voltage on the Base of an NPN transistor or Gate of an N-Channel MOSFET allows current to flow.
Voltage on the Base of an PNP transistor or Gate of an P-Channel MOSFET stops current flow.