In a CE transistor amplifier there is a current and voltage gain associated with the circuit. In other words, there is a power gain. Considering power a measure of energy, does the circuit violate conservation of energy?
In CE transistor amplifier, the DC supply is connected to give energy to signal. Due to this fact, there is a large pwer gain in CE configuration amplifier. So, energy of output signal is equal to the sum of energy of signal (low) and energy supplied by DC source in output CE circuit (VCE).Hence ,the circuit doesn't violate the conservation of energy.
