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Electrician's Math


Math, Science & Technology, Career Development and Occupational Studies, Literacy in Science and Technical Subjects (NYS 6-12 Common Core)

Grade Levels

Commencement, 9th Grade


Student calculation of the amperage usage in a sample house is evaluated on the basis of specified rubric.


Anthony George, Attica Senior High School


George, Anthony. “Electrician's Math.” In Career Development and Occupational Studies (CDOS) Resource Guide with Core Curriculum. New York State Department of Education, 197.


1 Week



Students will use formulas to calculate the number of amperes a typical house could use.


  • Students, working in groups or as a class, determine the typical electrical devices found in a home. (Don't forget the lights!)
  • Students determine the wattage rating of each device. Students check the nameplates of appliances, contact local appliance stores, or use the Internet to gather the specific information.
  • Students use the formula, Wattage = Voltage X Ampere, to calculate the amount of current for each appliance.
  • The information is to be included in a spreadsheet. Students calculate the total number of amperes.
  • Students discuss the concerns of an electrician (e.g., regarding whether or not all devices would be used simultaneously).
  • Discuss the most efficient way (mathematically) to reduce use of electricity.


  • Computer
  • Spreadsheet program (e.g., Excel)
  • Calculator


Discuss what would change if the voltage were increased from 110v to 220v, as the case is in Europe.

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