Phone Charger Efficiency

Be efficient in learning about efficiency. A fun hands-on activity has pupils calculate the efficiency of cell phone chargers by measuring the power in and power out. They also learn how to read and use circuit diagrams.

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CCSS: Designed
NGSS: Designed
Instructional Ideas
  • Have the class determine the efficiency of other chargers or appliances
Classroom Considerations
  • This is the third of seven lessons in the Off the Grid unit
  • Requires a variety of materials; see the resource for a complete list
Pros
  • Includes a student reference sheet for formulas and units
  • Teacher instructions have diagrams and pictures to show how materials should be set up
Cons
  • Does not provide a lab sheet
Common Core
NGSS