Прочитайте текст и определите, какой из заголовков соответствует тексту
Current transformers are used for operating ammeters, wattmeters, and other measuring devices. They produce in the meters a current lower than the measured current but proportional to it.
Current transformers also insulate the instrument from the circuit which is being measured. This is necessary for high voltage circuits.
Wattmeters
Ammeters
Devices
Current Transformers