Wataƙila kowa ya san mita makamashin lantarki. A zamanin yau, ana yawan amfani da mitoci masu wayo don aunawa da lissafin wutar lantarkin gida. Idan ka duba da kyau, za ka ga cewa akwai siga 5 (60) da aka rubuta a fitaccen matsayi na mitar makamashin lantarki.

Misali, ma'aunin da ke cikin jajayen da'irar da ke cikin hoton da ke sama: 5 (60) A. Idan muka dubi raka'ar, mun san cewa an rubuta ta a matsayin halin yanzu, to mene ne alakar wadannan igiyoyi guda biyu? Me zai faru idan aka wuce na yanzu? Bari mu yi magana game da abin da igiyoyin biyu ke nufi bisa ga maƙallan waje (5) da kuma cikin maƙallan (60).
Yanzu a cikin maɓalli
Halin halin yanzu a cikin baka - 60A a cikin misali, yana nufin matsakaicin ƙimar halin yanzu na mita makamashi. Bambanta da sauran kayan aiki, ƙimar halin yanzu na mitar makamashin lantarki yana da tasiri sosai da abubuwan muhalli, don haka ana barin wani yanki gabaɗaya lokacin da ya bar masana'anta - ainihin matsakaicin matsakaicin halin yanzu shine 120% na alamar halin yanzu. Sabili da haka, idan lambar a cikin ƙididdiga ta 60, matsakaicin ƙididdiga na yanzu shine 72A - idan ba yanayi mai tsauri ba ne, tasirin mafi girman halin yanzu ba zai kai 20%. Don haka, madaidaicin ƙimar mita na yanzu da aka yiwa alama da 60A shine gabaɗaya kusan 66A a ainihin amfani.
Me zai faru idan wannan ƙimar ta wuce? Amsar ita ce ma'aunin da ba daidai ba - watakila ƙari, watakila ƙasa.
Maƙallan waje na yanzu
Guda 5 da ke wajen mahaifa a nan ana kiranta ainihin halin yanzu, wanda kuma ake kira da calibration current. An ƙaddara ta hanyar farawa na yanzu na mita makamashi na lantarki - ƙananan ƙimar halin yanzu wanda ke ba da damar mitan lantarki don ci gaba da juyawa da ci gaba da aunawa. Mafarin halin yanzu na gaba ɗaya mai wayo shine 0.4% na ƙimar halin yanzu. Wato za a yi cajin mita mai kimar halin yanzu na 5A matuƙar na yanzu a kewayen ya kai 0.02A lokacin da ake amfani da shi. Za a sami rabo tsakanin ma'aunin da aka ƙididdigewa da matsakaicin matsakaicin halin yanzu, kamar 5 (60) A, wanda shine dangantaka sau 4. Ana kiran wannan rabon "load wide". Gabaɗaya, akwai sau 2, sau 4, sau 6, sau 8 ko ma fiye da sau goma - mafi girman girman nauyin nauyi, ƙarfin matakin fasaha da ake buƙata, kuma farashin mita zai zama mafi girma.
Sabili da haka, lambobin da ke waje da mahaifa ba su da alaƙa da ainihin amfani da mai amfani-fiye ko žasa da wannan ƙimar ba zai shafi ma'aunin mita ba. Akwai galibin bangarori biyu da yanayin halin yanzu ya shafa: farashin mitar (wanda ke da alaƙa da faɗin kaya) da lokacin farawa (ƙididdigar ta halin yanzu).