The current and voltage characteristics of carbon and tungsten filament light bulbs are compared by plotting their I-V curves or measuring their resistance directly. As the voltage is varied, the resistance of each filament type is measured, showing that the resistance of tungsten increases significantly with temperature, exhibiting a positive temperature coefficient. Conversely, carbon filament displays a more complex behavior, often with a negative temperature coefficient at certain ranges. This comparison highlights the differences in how materials respond to changes in temperature and how these properties affect their practical applications in electrical and lighting devices.