Electronics

noun

1. The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles or by converting the flow of charged particles to or from other forms of energy.

   "Electronics is a popular subject."

2. (in the plural) A device or devices which require the flow of electrons through conductors and semiconductors in order to perform their function; devices that operate on electrical power (battery or outlet)
3. Electronic circuitry.

   "The electronics are completely updated."