This is the only form of energy usable for transmissions in short-distance metallic wires?

Electrical energy is indeed the primary form of energy used for transmissions in short-distance metallic wires. In conductive materials, such as copper or aluminum, electrical energy is carried through the movement of electrons. This movement allows for the transmission of signals and power over short distances efficiently.

The properties of metals make them excellent conductors of electricity, facilitating the flow of electrical current with minimal resistance, which is crucial for effective communication in electronic circuits. This is especially relevant in applications such as telecommunication systems and local area networks, where electrical signals are frequently transmitted through cables.

While electromagnetic energy is essential for wireless transmissions, it is not the mode of energy used in metallic conductors; thus, it does not apply to the context of the question. Static energy and nuclear energy are not practical or applicable in typical short-distance wired transmission scenarios, making electrical energy the only suitable choice.