power strip vs rectifier

power strip

noun
  • A block of electrical sockets that attaches to the end of a flexible cable and allows multiple electrical devices to be plugged in. 

rectifier

noun
  • A device that converts alternating current into direct current; often a diode. 

  • The activation function f(x)= max (0,x), where x is the input to a neuron. 

  • An instrument used for determining and rectifying the variations of the compass on board ship. 

  • Something that rectifies. 

How often have the words power strip and rectifier occurred in a corpus of books? (source: Google Ngram Viewer )