[amp_mcq option1=”Current source” option2=”Voltage source” option3=”Divider” option4=”Buffer” correct=”option1″]
The correct answer is: A. Current source
A current source is a two-terminal electronic component that delivers or absorbs a constant current regardless of the voltage across it. A current source is a type of voltage-controlled current source (VCCS) that uses a transistor to control the current through a load. The transistor is configured as a common-emitter amplifier, with the load connected to the collector. The base-emitter voltage of the transistor is controlled by a voltage source, which sets the current through the collector.
When both transistors are in saturation, they act as a current source. This is because the collector current of a transistor is proportional to the base current, and the base current is controlled by the voltage source. As long as the voltage source is constant, the collector current will also be constant.
The other options are incorrect because they do not describe the behavior of a transistor when it is in saturation. A voltage source is a two-terminal electronic component that maintains a constant voltage across its terminals regardless of the current through it. A voltage divider is a circuit that produces an output voltage that is a fraction of the input voltage. A buffer is a circuit that isolates one part of a circuit from another.