The Biggest Misconception About Electricity

Caption notes

Veritasium uses a battery-and-bulb circuit to distinguish the drift of electrons from the transfer of electrical energy. The narrator uses the Poynting vector to describe energy flow in the electromagnetic field and explain how energy enters the filament in this example. The film returns to a thought experiment with very long wires and a bulb close to the source. With idealized resistance-free wires and an instantly responsive bulb, the narrator distinguishes the first signal to reach the bulb from reaching full battery voltage and says the initial voltage depends on the impedance of the lines and the bulb.