How are the potential difference (V), current (I) and resistance (R) related?

State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.

How is the current flowing in a conductor changed if the resistance of conductor is doubled keeping the potential difference across it the same?

Figure below shows two conductors A and B. Their charges and potentials are given in the diagram. State the direction of (i) flow of electrons, and (ii) flow of current, when both the conductors are joined by a metal wire.