In a liquid, the increased temperature causes the molecules to move faster, which means that they spend less time … There are so few free electrons that hardly any current can flow. The effect of temperature on the IV characteristics of a solar cell. Suppose the resistance of a conductor at 0o C is R0 Ω increasing the temperature to C, the resistance becomes Rt Ω, as shown in fig. In a conductor, which already has a large number of free electrons flowing through it, the vibration of the atoms causes many collisions between the free electrons and the captive electrons. Why does dielectric constant increases or decrease with temperature? Therefore at high temperatures the resistance of an insulator can fall, and in some insulating materials, quite dramatically. Most conductive materials change specific resistance with changes in temperature. Thermal resistance is defined as the ratio of the temperature difference between the two faces of a material to the rate of heat flow per unit area. thicker wires have less resistance to current flow than thinner wires), the resistance of a conductor also changes with changing temperature. The Resistivity of Various Materials. The decrease in resistance of the thermistor in relation to the other resistor which is fixed as the temperature rises will cause the transistor to turn on. This behaviour can be better understood if one considers that the interatomic spacing increases when the amplitude of the atomic vibrations increases due to the increased thermal energy. The resistance does not only increase with the rise in temperature but it also decreases in some cases. In a solar cell, the parameter most affected by an increase in temperature is the open-circuit voltage. This is the end of the story for conductors, but the resistance of semiconductors depends upon temperature in an additional manner. The viscosity of a liquid decreases as the temperature is raised, while the viscosity of a gas increases as the temperature is raised. thicker wires have less resistance to current flow than thinner wires), the resistance of a conductor also changes with changing temperature. It is the increase in resistance per ohm original resistance per °c rise in temperature is called temperature co-efficient. [CDATA[>