A lamp is connected to a 120 V line. When the switch is first turned on and the filament is cold, the current through the lamp is 8 A, but this drops quickly to 0.5 A when the filament is hot. By what factor is the lamps resistance increased due to the change in temperature?

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Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.