Problem: The tungsten filament in an incandescent light bulb has a resistance of 1.5 ohm when the bulb is not turned on at 20°C. When the bulb is connected to a voltage of 3.8 V, a current of 0.23 Amp flows through it.
Part A: What is the operating temperature of the filament?
Please show how you obtained the operating temperature of the filament.