Question 473Electricity & Electronics - Assistant Engineer

The correct answer is C) 400. To calculate the power gain, we need to use the formula: Power Gain = (Output Power) / (Input Power). In this case, the input power is 0.1 V * 0.5 mA = 0.05 mW, and the output power is 2.0 V * 10 mA = 20 mW. The power gain is therefore 20 mW / 0.05 mW = 400. The other options are incorrect because: A) 20 is too low and does not match the calculated power gain of 400. B) 40 is too low and does not match the calculated power gain of 400. D) 4000 is too high and does not match the calculated power gain of 400.