In a power transistor _____ is controlling parameter

Power transistor:

• They are used in high power amplification application.
• It is designed specifically to control high current – voltage ratings and very high power in the circuit.
• The power transistor is a three-layer NPN and PNP device.

• In this type of transistors collector current I_c is the function of base current I_B i.e. a change in the base current giving a corresponding amplified change in the collector current for a given collector-emitter voltage V_CE.

• Transistors can act as open or close switch depends on the base current.
• If the base current is zero, then the collector current is very small leakage current, and hence under there conditions transistor act as an open switch.
• If a sufficient amount of base current is supplied which drives the transistor into a saturation state then the transistor acts as a close switch.

Note:

Remember that base current IB is the controlling parameter and collector current Ic is the controlled parameter of the power transistors.