Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > A power transistor is a _________ device.a)tw...
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A power transistor is a _________ device.
- a)two terminal, bipolar, voltage controlled
- b)two terminal, unipolar, current controlled
- c)three terminal, unipolar, voltage controlled
- d)three terminal, bipolar, current controlled
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
A power transistor is a _________ device.a)two terminal, bipolar, volt...
A power transistor is a three-terminal, bipolar, current-controlled device. Let's break down each component of this answer to understand why it is the correct option.
Three-terminal device:
A power transistor has three terminals: the base, collector, and emitter. These terminals are used for input, output, and control purposes, respectively. The three-terminal configuration allows for greater flexibility in circuit design and functionality.
Bipolar device:
A power transistor is considered bipolar because it utilizes both types of charge carriers, namely electrons and holes, for its operation. It consists of two junctions: the base-emitter junction and the base-collector junction. Bipolar transistors can amplify both current and voltage signals, making them suitable for a wide range of applications.
Current-controlled device:
In a power transistor, the base current controls the flow of current between the collector and the emitter. When a small current is applied to the base terminal, it controls a larger current flowing through the collector and emitter terminals. This current gain or amplification factor is known as the transistor's beta (β) value. By varying the base current, the collector current can be controlled, making the power transistor a current-controlled device.
To summarize, a power transistor is a three-terminal device that utilizes both types of charge carriers (bipolar) and is controlled by the flow of current (current-controlled). Option D, which states that a power transistor is a three-terminal, bipolar, current-controlled device, is the correct answer.
Three-terminal device:
A power transistor has three terminals: the base, collector, and emitter. These terminals are used for input, output, and control purposes, respectively. The three-terminal configuration allows for greater flexibility in circuit design and functionality.
Bipolar device:
A power transistor is considered bipolar because it utilizes both types of charge carriers, namely electrons and holes, for its operation. It consists of two junctions: the base-emitter junction and the base-collector junction. Bipolar transistors can amplify both current and voltage signals, making them suitable for a wide range of applications.
Current-controlled device:
In a power transistor, the base current controls the flow of current between the collector and the emitter. When a small current is applied to the base terminal, it controls a larger current flowing through the collector and emitter terminals. This current gain or amplification factor is known as the transistor's beta (β) value. By varying the base current, the collector current can be controlled, making the power transistor a current-controlled device.
To summarize, a power transistor is a three-terminal device that utilizes both types of charge carriers (bipolar) and is controlled by the flow of current (current-controlled). Option D, which states that a power transistor is a three-terminal, bipolar, current-controlled device, is the correct answer.
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Community Answer
A power transistor is a _________ device.a)two terminal, bipolar, volt...
Power transistor is simply many BJT’s connected in series parallel on a single silicon chip for power applications. It is a three terminal, bipolar, current controlled device.
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A power transistor is a _________ device.a)two terminal, bipolar, voltage controlledb)two terminal, unipolar, current controlledc)three terminal, unipolar, voltage controlledd)three terminal, bipolar, current controlledCorrect answer is option 'D'. Can you explain this answer?
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