You are presented with the quiz "What powers a light bulb?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aswitch is used to start the flow of current in an electrical circuit" and "with switch closed, electricity flows through wires, switch and bulb, to light up the bulb". 

So, what's the best answer to the question?


 

        The flow of electrical current   