तापमान में वृद्धि के साथ निम्नलिखित में से किस पदार्थ की विद्युत प्रतिरोधकता (resistivity) बढ़ती है?

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?