Fourth graders at Holland Brook School extended their electricity unit in science by investigating how much electricity different electric devices use.  The devices included desktop and laptop computers, a hair dryer, a cell phone, and lamps with LED and incandescent bulbs.  The "Watts Up" electricity activity challenged students to predict which devices use the most electricity, then to measure electricity usage from a watt meter.  They used their multiplication skills to calculate the kilowatt hours each device used.  Many of the students were surprised to see how much electricity the devices used when left on for a long period of time.  The activity ended with a reminder that students have the power to conserve electricity by turning lights and electronics off when they are not using them both at home and at school.