1. The voltage and resistance relation is given by the ohm’s law
Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Ohm’s law can de depicted in formula as
V ∝ I
Therefore, V = RI where R is a constant called resistance. R depends on the dimensions of the conductor and also on the material of the conductor. Its SI unit is Ohm (Ω).
2. The current can remain constant in a circuit if the circuit is connected in series. The amount of current in a series circuit is the same through any component in the circuit. This is because there is only one path for current flow in a series circuit.