Question

For a transistor, the current ratio 'β_dc' is defined as the ratio of ______.

Options

• collector current to emitter current.

• collector current to base current.

• base current to collector current.

• emitter current to collector current.

Answer 1

For a transistor, the current ratio 'β_dc' is defined as the ratio of collector current to base current.

Explanation:

The current amplification factor of a transistor for direct current (DC) is the ratio of collector current (l_c) to the base current (l_B) in common emitter configuration i.e.,

`"B"_"DC" = "l"_"C"/"l"_"B"`

However, the ratio of collector current to the emitter current gives the value of current amplificatlon factor in common base configuration, i.e.,

`alpha_"DC" = "l"_"C"/"l"_"E"`