A bipolar transistor has three leads: the base, collector, and emitter.

More Questions from Bipolar Junction Transistors (BJT)

• Transistors are controlled to operate as a switch or to operate as a variable resistor.
• In a common-base (C-B) amplifier, the output is 180 degrees out of phase with the input.
• In a BJT, the collector current is approximately equal to the base current.
• If this circuit were used in a digital circuit, it would be a NOT gate.
• With a common-collector (C-C) amplifier the input is applied to the base and the output is taken from the emitter.
• A transistor used in a digital circuit will have two operating states, which are cutoff and saturation.
• BJTs are "junction" transistors because they use current-carrying P-N junctions.
• The voltage measured from the collector to the emitter is the sum of the voltage base-emitter plus the voltage collector-base.
• Current gain in a transistor is inversely proportional to collector current.
• The three bipolar transistor circuit configurations are common-base, common-emitter, and emitter-follower.

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