Particle accelerators are used to study the smallest constituents of matter. They accelerate particles up to enormous energies, then bring them into collision, spraying out a profusion of new particles. To make even a small mass needs a very high concentration of energy. The more powerful the accelerator, the higher the collision energy and the heavier the particles that can be created.
Television sets use the same principles as particle accelerators.
In a TV, negatively charged electrons are boiled off a hot wire, like the filament in a light bulb. The electrons are accelerated towards a positively charged electrode. Electromagnets are used to focus them into a beam and sweep them across the screen, building up a picture.