The easiest way to get started
Quiz yourself by typing answers
Hear the words and type them in
Multiple choice, true/false, matching
Match terms as fast as you can
Defend Earth from alien invaders
The two kinds of magnetic poles.
The two kinds of electrical charges.
A fundamental property of matter that can be either positive or negative.
A tiny imbalance between positive and negative charge on an object.
A flow of tiny particles that carries electrical energy In wires and machines. The particles ( usually electrons) are typically much smaller than atoms and can flow around and between atoms even in solid matter.
The unit of electric current.
The unit of potential energy.
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see
NEW! Voice Recording
Click the mic to start.