B

BJT (bipolar junction transistor): a type of transistor that relies on the contact of two types of semiconductor for its operation. BJTs can be used as amplifiers, switches, or in oscillators; so named because their operation involves two types of charge carriers (instead of just n-channel or p-channel), both electrons (NPN type) and holes (PNP type).

The BJT's three terminals are:   

Base (B) = input voltage
Emitter (E) = output voltage
Collector (C) = absorbed voltage (?)

bit: the basic unit of information in computing and digital communications; can have only one of two values (most commonly represented as 0 or 1), and may therefore be physically implemented with a two-state device.

byte: a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer, and for this reason it is the smallest addressable unit of memory in many computer architectures.