Assertion: A transistor amplifier in common e | vedclass

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Question

(A) The input impedance of a common emitter configuration is defined as $Z_{in} = \left| \frac{\Delta V_{BE}}{\Delta i_B} ight|_{V_{CE} = 	ext{cons

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) The input impedance of a common emitter configuration is defined as $Z_{in} = \left| \frac{\Delta V_{BE}}{\Delta i_B} ight|_{V_{CE} = 	ext{constant}}$.In a common emitter transistor, the base-emitter junction is forward-biased to allow current flow.Because the base-emitter junction is forward-biased, the base current $\Delta i_B$ is relatively large for a small change in base-emitter voltage $\Delta V_{BE}$.Since $Z_{in} = \frac{\Delta V_{BE}}{\Delta i_B}$, a small change in voltage divided by a relatively large change in current results in a low input impedance.Therefore, both the Assertion and the Reason are correct, and the Reason is the correct explanation for the Assertion.

Assertion: $A$ transistor amplifier in common emitter configuration has a low input impedance.
Reason: The base-to-emitter region is forward-biased.

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Assertion: $A$ transistor amplifier in common emitter configuration has a low input impedance.Reason: The base-to-emitter region is forward-biased.