How to calculation transformer winding || কিভাবে ট্রান্সফরমার এর ভোল্ট ও এম্পিয়ার বের করা যায় শিখুন 

How to calculation transformer winding || কিভাবে ট্রান্সফরমার এর ভোল্ট ও এম্পিয়ার বের করা যায় শিখুন।
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