Ключевые слова: appliance, background, banknote, bill, business, cable, cash, commerce, concept, conceptual, connection, consume, cost, current, economy, electric, electrical, electricity, energy, environment, expense, expensive, fee, finance, financial, flow, home, increase, metaphor, money, pay, plug, power, price, pricing, raise, rise, savings, socket, supply, symbol, technology, usage, voltage, wattage,