Electricity Quiz

Alternating current is what come out of the wall; the flow of electricity switches direction constantly. Direct current comes out of batteries and solar cells, and that current only goes in one direction.

Whether electricity should be distributed as AC - as proposed by Nikola Tesla and George Westinghouse - or DC. Thomas Edison fought hard for DC, for example by having animals electrocuted with AC to persuade people is was dangerous. He lost, obviously. That's AC coming out of your wall.

The ice cream cone. You could definitely eat ice cream while enjoying his other inventions though.

They're definitely electric. They can make 650 volts with organs that work like batteries. But they aren't really eels. They're long and skinny like eels, but they happen to be part of a group called knifefish.

It changes voltage. For example, it changes the high-voltage electricity that travels through transmission lines into the low-voltage electricity you want in your house.

Fossil fuels. About half of our electricity comes from coal; the No. 2 source is natural gas, then nuclear power is in third place.

A magnet on a shaft spins, making an electrical current in the wires around it. Different power plants get that shaft to spin in different ways, like by heating up water to make steam or harnessing a handy breeze.

The song is called "Electric Boogie." Fun fact: The guy who choreographed the electric slide (yeah, apparently someone choreographed it) gets all upset when people post videos on YouTube of the dance being done "wrong." He filed a Digital Millennium Copyright Act notices.