So doubling or tripling the voltage will cause the current to be doubled or tripled. On the other hand, any alteration in the resistance will result in the opposite or inverse alteration of the current. So doubling or tripling the resistance will cause the current to be one-half or one-third the original value.

The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm’s law, I = V/R, can be used to predict the behavior of the material.

For a metallic wire with increase in temperature the resistance of the wire increases hence the ratio of voltage to corresponding current increases with rise in temperature.

The number one law in circuit analysis is Ohm’s law: V = IR. Under this relationship, if voltage doubles and resistance halves, you will get 4x the original current.

The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.

Resistance of a conductor depends on length of the conductor and area of cross section of the conductor, resistivity and temperature. Resistivity is a materialistic property depends on the material and temperature of the conductor.

As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up. For some materials, resistivity is a linear function of temperature. The resistivity of a conductor increases with temperature.

The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature.