Electrometallurgy, the science of producing metals from metallic ores through the use of electricity. It deals with both the use of electricity for various heating processes and the use of electricity to produce chemical changes (a process called electrolysis).
Electronics, the branch of science and technology concerned with the nature, uses, and manufacture of devices in which electrons flow through a gas, vacuum, or semiconductor. Learn all about electronics.
Radar seems to have infinite uses: Police use it to clock your speed, NASA uses it to follow satellites, meteorologists use it to track storms and the military uses it to track the enemy ... Learn all about radar technology!