Ключевые слова: adult, background, battery, black, check, computer, concept, connect, connection, cords, device, electric, electrical, electrician, electricity, electronic, energy, equipment, extension, hand, hardware, instrument, level, line, measurement, mechanic, mechanical, meter, multimeter, multiple, people, person, plastic, plug, power, probe, service, set, shop, socket, technician, technology, test, tester, tool, upgrade, voltage, voltmeter, wire, worker,