'...Yes, yes, force. Force from the battery completes a circuit and the rush of energy goes out into a bulb, which emits light. It'll last as long as the battery will. Which... I think this is a good torch and battery, so a while. Once it runs out, it will need to be plugged in again to regain the lost energy. Or force. Think of it... Like your bow. When you let go of the arrow, it flies forward using the strength you used to pull it back.'<br/>Oh, it had been a while since he'd travelled with anyone from the past...<br/><br/>'...Ah, well. That is a little more complicated, but yes. Similar energy, but more powerful. The torch, yes. My ship, not everybody has that wonder.'