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When a transistor is connected in common emitter mode it will have
- a)Negligible input resistance and high output resistance
- b)High input resistance and low output resistance
- c)Medium input resistance and high output resistance
- d)low input resistance as well as output resistance
Correct answer is option 'B'. Can you explain this answer?
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When a transistor is connected in common emitter mode it will havea)Ne...
Common Emitter Mode:
In common emitter mode, the base terminal of the transistor is the input, the collector terminal is the output, and the emitter terminal is common to both input and output.
Input Resistance:
The input resistance, also known as the base resistance (Rin), is the resistance seen by the input signal at the base terminal of the transistor. It determines how much current is required to drive the base-emitter junction.
Output Resistance:
The output resistance, also known as the collector resistance (Rout), is the resistance seen by the output signal at the collector terminal of the transistor. It determines how much the output voltage changes for a given change in the collector current.
Explanation:
High Input Resistance:
When a transistor is connected in common emitter mode, the base-emitter junction is forward-biased. This biasing configuration results in a high input resistance. The base-emitter junction acts as a diode and offers a high resistance to the input signal. Therefore, option B, "High input resistance," is the correct answer.
Low Output Resistance:
In common emitter mode, the collector current flows through the collector resistor (RC). This results in a voltage drop across the collector resistor, which helps in amplifying the input signal. As a consequence, the output resistance is low, as the amplified signal can be easily transferred to the load. Therefore, option B, "Low output resistance," is the correct answer.
Negligible Input Resistance and High Output Resistance:
Option A, "Negligible input resistance and high output resistance," is incorrect because in common emitter mode, the input resistance is not negligible. The base-emitter junction offers a high resistance to the input signal. Additionally, the output resistance is low, not high, as explained above.
Medium Input Resistance and High Output Resistance:
Option C, "Medium input resistance and high output resistance," is incorrect because the input resistance is high, not medium, as discussed above. The output resistance is low, not high, as explained above.
Low Input Resistance as well as Output Resistance:
Option D, "Low input resistance as well as output resistance," is incorrect because the input resistance is high, not low, and the output resistance is low, not high, as explained above.
In common emitter mode, the base terminal of the transistor is the input, the collector terminal is the output, and the emitter terminal is common to both input and output.
Input Resistance:
The input resistance, also known as the base resistance (Rin), is the resistance seen by the input signal at the base terminal of the transistor. It determines how much current is required to drive the base-emitter junction.
Output Resistance:
The output resistance, also known as the collector resistance (Rout), is the resistance seen by the output signal at the collector terminal of the transistor. It determines how much the output voltage changes for a given change in the collector current.
Explanation:
High Input Resistance:
When a transistor is connected in common emitter mode, the base-emitter junction is forward-biased. This biasing configuration results in a high input resistance. The base-emitter junction acts as a diode and offers a high resistance to the input signal. Therefore, option B, "High input resistance," is the correct answer.
Low Output Resistance:
In common emitter mode, the collector current flows through the collector resistor (RC). This results in a voltage drop across the collector resistor, which helps in amplifying the input signal. As a consequence, the output resistance is low, as the amplified signal can be easily transferred to the load. Therefore, option B, "Low output resistance," is the correct answer.
Negligible Input Resistance and High Output Resistance:
Option A, "Negligible input resistance and high output resistance," is incorrect because in common emitter mode, the input resistance is not negligible. The base-emitter junction offers a high resistance to the input signal. Additionally, the output resistance is low, not high, as explained above.
Medium Input Resistance and High Output Resistance:
Option C, "Medium input resistance and high output resistance," is incorrect because the input resistance is high, not medium, as discussed above. The output resistance is low, not high, as explained above.
Low Input Resistance as well as Output Resistance:
Option D, "Low input resistance as well as output resistance," is incorrect because the input resistance is high, not low, and the output resistance is low, not high, as explained above.
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When a transistor is connected in common emitter mode it will havea)Negligible input resistance and high output resistanceb)High input resistance and low output resistancec)Medium input resistance and high output resistanced)low input resistance as well as output resistanceCorrect answer is option 'B'. Can you explain this answer?
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