Final answer:
The common elements of all signal systems include a sender, a medium, and a receiver. Examples of signal systems include electromagnetic waves and sound waves.
Step-by-step explanation:
The common elements of all signal systems can be described as the key components that allow signals to be transmitted and received effectively. These elements include a sender, a medium, and a receiver.
The sender generates the signal, which is then transmitted through a medium, such as air or cables, and received by the receiver.
Examples of signal systems in physics include electromagnetic waves used in communication systems or sound waves used in audio devices.