यदि किसी तांबे के तार को एकसमान रूप से खींचकर उसकी लंबाई को दोगुना कर दिया जाए, तो उसका नया प्रतिरोध मूल प्रतिरोध का कितना गुना हो जाएगा?

Why are alloys such as nichrome commonly used for heating elements in electric kettles instead of pure metals?

In a standard DC circuit, what is the conventional direction of electric current?

Which of the following expressions does NOT accurately represent the formula for electrical power P?