Pentru determinarea valorii curentului in linia de alimentare vom folosi ampermetre termice sau ampermetre obisnuite, prevazute cu termocuplu. in lipsa acestora, vom folosi beculete de voltaj si amperaj redus (1,5 V/0,3—0,5 A), conectate in paralel cu conductorul liniei (fig. 291), intre doua puncte AB, intre care beculetul se aprinde suficient.
Putem folosi si sistemul montarii becului in serie cu conductorul prin intreruperea acestuia, dar in acest caz acordul sau reglajul facut se modifica in momentul scurtcircuitarii beculetului. Putem, de asemenea, folosi un undametru cu absorbtie, ca cel prezentat in fig. 292, asezat cu bobinajul in apropierea conductorului.
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