ট্রান্সফরমারের এই একটি ইম্পিড্যান্স থেকে অপর আরেকটি ইম্পিড্যান্স সে পরিবর্তন করার ক্ষমতা অর্থাৎ ইম্পিড্যান্স মেলানোই সর্বাধিক পাওয়ার ট্রান্সফার কে নিশ্চিত করে।
ఇచ్చిన ఇంపెడెన్స్ ను మరొక ఇంపెడెన్స్ గా మార్చడమే ఈ ట్రాన్స్ ఫార్మర్ యొక్క సామర్ధ్యం, ఇది మాక్సిమం పవర్ ట్రాన్స్ఫర్ ను నిర్ధారిస్తుంది.