The current gain in the common emitter mode of a transistor is 10. The input impedance is 20 kΩ and load of resistance is 100 kΩ. The power gain is: |
300 500 200 100 |
500 |
The power gain is defined as the ratio of change in output power to the change in input power. Since, P = VI Therefore, Power gain = current gain × voltage gain $=β×β(\frac{R_{out}}{R_{in}})=β^2(\frac{R_{out}}{R_{in}})$ Here, $β = 10\,, R_{in}=20kΩ\,, R_{out}=100kΩ$ ∴ Power gain = $(10)^2(\frac{100}{20})=100×50=500$ |