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  4. For a transistor, the current ratio 'β'dc is defined as the ratio of

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Q. For a transistor, the current ratio $'\beta'_{dc}$ is defined as the ratio of

MHT CETMHT CET 2019Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The current amplification factor of a transistor for direct current (DC) is the ratio of collector current $\left(I_{C}\right)$ to the base current $\left(I_{B}\right)$ in common emitter configuration i.e.,
$B_{D C}=\frac{I_{C}}{I_{B}}$
However, the ratio of collector current to the emitter current gives the value of current amplification factor in common base configuration, i.e.,
$\alpha_{ DC }=\frac{I_{C}}{I_{E}}$