Each resistance in the given cubical network has resistance of $$1 \Omega$$ and equivalent resistance between $$A$$ and $$B$$ is

$$I-V$$ characteristic of a copper wire of length $$L$$ and area of cross-section $$A$$ is shown in figure. The slope of the curve becomes

The readings of ammeter and voltmeter in the following circuit are respectively

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because