Mystery #3Tier 2electricity / light / heat
How does invisible electricity turn into bright light in a bulb?
Electricity is completely invisible. You cannot see it flowing through a wire, no colour, no shine, nothing. Yet send it into a bulb and out pours dazzling light, bright enough to fill a room. So how does something you cannot see at all turn into something so bright?
Your guess
What do you reckon turns invisible electricity into visible light?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.