Which component serves as the generator of RF energy in a transmitter?

In a transmitter, the component responsible for generating radio frequency (RF) energy is the oscillator. The oscillator produces a continuous wave at a specific frequency, which is crucial for the transmission of radio signals. This generated RF energy can then be amplified, modulated, and later sent through the antenna for transmission.

The oscillator operates on the principle of resonance to create oscillations at desired frequencies. It’s specifically designed to generate stable and precise frequencies needed for various communication applications. The quality and stability of the signal generated by the oscillator are crucial, as they directly impact the clarity and reliability of the transmitted signal.

Other components, such as the power amplifier, play important roles in strengthening the signals for transmission, but they do not generate RF energy themselves. The key is used for switching the transmitter on and off, while the antenna serves as the medium to radiate the RF energy into space. Thus, the oscillator's primary function in generating RF energy makes it the correct answer.