I don't usually jump on quality control (or lack thereof) bandwagons, but the electricity clue was a disaster. And it was next to a category called "Units of Measure", so why was it even in the game?
China is the top consumer of electricity, in 2016 using more than 5 trillion of these units.
They should have just said "what does kwh stand for, because China used a buttload of them".
I like to make "Fermi estimates" in the shower, or to bore myself to sleep - I've guesstimated the weight of the earth or the volume of weather balloons to launch in a lawn chair many times, and usually within an order of magnitude. I can NOT, however get to a position to decide if this is supposed to be kilowatts, megawatts, or kwh. Nobody can relate to trillions of units of anything anymore than we can relate to astronomical distances. (and more amazingly, it's further to the bottom of the length scale than it is to the edge of the universe)
for the masochist, here is my Fermi estimate for this clue:
Spoiler
Assuming there are 1.5 billion Chinese. Estimating my consumption at $200/mo for $0.10/kwh means 2000 kwh per month = 25000 kwh/year. Simplify the math and heavily discount the usage from our wasteful habits and call it 1 billion Chinese using 10000 kwh/year means 10 trillion. It looks like half of this, so finally, I know they mean energy, not power (no way to work a 5000x divisor in the guess).