Ключевые слова: ammeter, antenna, battery, checking, coil, color, device, effect, electric, electrical, electromagnetic, electronic, energy, equipment, experiment, field, force, frequency, generator, graph, icon, illustration, infrared, item, light, meter, physics, prism, radiance, radio, range, scale, science, scientific, spectrum, sv, symbol, tech, technology, testing, tool, ultraviolet, vibration, waves, xray,