एक विद्युत परिपथ के भीतर भौतिक अर्थ में जड़त्व (inertia) के समतुल्य भूमिका निम्नलिखित में से कौन सी परिघटना निभाती 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?