Which element of an electrical telecommunications system acts to amplify signals?

The transmitter is the component of an electrical telecommunications system that plays a crucial role in amplifying signals. Its main function is to convert information into electrical signals that can be transmitted over a medium. In order to ensure that these signals maintain their strength and integrity over distances, the transmitter amplifies them before they are sent out. This amplification helps to overcome any potential loss that might occur as the signals travel through the transmitting medium.

In contrast, the other components serve different primary functions. The receiver captures the transmitted signals and converts them back into a usable form, while the transmitting medium refers to the physical path (like cables or air) the signals travel through. The modulator is responsible for modifying the signals for transmission but does not amplify them. Thus, the transmitter is essential for ensuring that signals are strong enough to be effectively sent and received.