The value of the forward current gain of the power transistor is approximately ____________.

Concept

The forward current gain (α) of a power transistor is defined as:

\(α ={I_C\over I_E}\)

where, I_C = Collector current

I_E = Emitter current

For power transistors, the forward current gain (α) is typically high, usually in the range of 0.95 to 0.99. This indicates that most of the emitter current flows to the collector, with very little loss to the base current.

\(β ={α\over 1-α}\)

where β is the common-emitter current gain, having α close to 1 ensures that power transistors operate efficiently with high current gain.

Thus, the correct approximate value of forward current gain for power transistors is 0.95 to 0.99.