12.vattmetr asbobi shkalasini darajalash
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laboratoriya ishi № 23 vattmetr asbobi shkalasini darajalash kerakli asbob va jihozlar: o‘zgaruvchan tok manbai, vattmetr, ampermetr, voltmetr, lampali yoki boshqa turdagi reostat (iste’molchi sifatida foydalanish uchun), kalit va ulash simlari. ishning maqsadi: o‘zgaruvchan tokning quvvatini o‘lchash metodi bilan tanishish, vattmetr shkalasini darajalashni o‘rganish. qisqacha nazariya: o‘zgarmas tok zanjiridagi quvvatni quyidagi formula orqali aniqlanadi: p = iu (1) o‘zgarmas tok zanjiridagi quvvatni tajribada vattmetr asbobi yordamida ham aniqlash mumkin. quvvatni vattmetrda o‘lchash qulayroq, chunki bu asbob shkalalari bevosita quvvat kattaligida darajalangan bo‘ladi. amalda tok manbaining davriy yoki davriy emasligiga qarab quvvatni o‘lchashda turli sistemalarda ishlovchi vattmetrlar b...
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