Ключевые слова: background, black, blue, cable, charge, charger, children, city, current, danger, design, electric, electrical, electricity, energy, engine, engineering, equipment, fuel, generation, industrial, industry, isolated, line, lines, modern, network, old, parking, pollution, power, red, road, sign, signal, sky, street, symbol, tank, technology, transportation, travel, tube, urban, volt, voltage, white, world,