You have warmed it, and increased its resistance slightly. Before it heats up, the filament is cooler and more conducting. A lie detector circuit relies on the likelyhood that the resistivity of your body changes when you tell a lie. Nervousness promotes perspiration, which lowers the body's electrical resistance, and increases whatever current flows. If a person is able to lie with no emotional change and no change in perspiration, then such a lie detector will not be effective.
Thermal energy is the graveyard of electrical energy.
Thick wires have less resistance and will more effectively carry currents without excessive heating. The resistance will be half again when the cross-sectional area is doubled, so it will be 2.5 ohms. If both voltage and resistance are doubled, current remains unchanged. Likewise if both voltage and resistance are halved. Current will be greater in the bulb connected to the 220-volt source.