If a wire of resistance R is melted and recast to half of its length, then new resistance of the wire will be:

(a) Express ohm’s law by a mathematical formula.

(b) Draw a circuit diagram to verify ohm’s law.

(c) Present the relationship between the voltage applied across a conductor and the current flowing through it graphically.

No current flows between two charged bodies when connected, if they have the same:

n equal resistors are first connected in series and then connected in parallel. The ratio of the maximum to the minimum resistance is:

If R₁ and R₂ are the resistances of filaments of a 400 W and a 200 W lamp, designed to operate on the same voltage, then: