Please answer the following question: Fact 1: Aswitch is used to start the flow of current in an electrical circuit.  Fact 2: With switch closed, electricity flows through wires, switch and bulb, to light up the bulb.  Given the two facts above, answer the question "What powers a light bulb?" with the following options:  - structure and function  - The tungsten filament  - photosynthetic pigments?  - Unplugging a lamp  - heat production  - heat is produced  - Unscrewing a light bulb  - The flow of electrical current
Answer:
The flow of electrical current