वे पदार्थ जो अपने भीतर से विद्युत धारा को आसानी से प्रवाहित नहीं होने देते, कहलाते हैं _________।

The potential difference (V) between two points is defined as:

Which instrument is used to measure the potential difference between two points in an electric circuit?

Which law states that V = IR?