Ключевые слова: aged, automobile, check, circuit, commercial, community, concepts, control, counter, dial, display, efficiency, efficient, electrician, electricity, electronic, expensive, global warming, horizontal, hours, instrument, intelligence, load, measure, measurement, measuring, money, monitor, motor, number, pay, payment, power, rate, reading, reminder, residential, safety, save, saving, service, smart, solar, standing, steel, supply, system, transportation, up, utility,