यदि किसी चालक का प्रतिरोध बढ़ाकर तीन गुना कर दिया जाए, तो विद्युत धारा होगी: (विभवांतर V स्थिर रहता है)

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?