A 85 W lightbulb operates on a potential difference of 80 V. Find the current in the bulb. Find the resistance of the bulb. If this bulb is replaced with one whose resistance is half the value found in part B, is its power rating greater than or less than 85 W. By what factor?

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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.