A given wire is stretched to double its length. How will its resistance change ?
A wire of 3 Ω a resistance and 10 cm length is stretched to 30 cm length. Assuming that it has uniform cross-section, what will be its new resistance ?
A rheostat and a resistance box are both used to change current in a circuit. In what respect the two differ from each other?
How do we symbolically represent a connecting wire and a resistor ? What is the significance of the symbol of a resistor ?
What sets the electrons into motion in an electric circuit ?