उच्च आवृत्ति (high-frequency) अनुप्रयोगों में आमतौर पर _______ का उपयोग किया जाता है क्योंकि चुंबकीय कोर सामग्री न होने के कारण इनमें कोई लौह हानि (iron loss) नहीं होती है।

A step-down transformer connected to an AC mains supply of 220 V operates an 11 V, 44 W lamp. Ignoring power losses, what is the current in the primary circuit?

A transformer has 200 turns in its primary winding and 1000 turns in its secondary winding. What type of transformer is this?