<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca9f9c090f3_-_circuit-breaker-lg.jpg>
<http://www.popularmechanics.com/home/how-to/a5571/how-your-circuit-breaker-works/>