02 HMWK-Caculating Mass Number



Kill-o-watt Lab01APES – Energy UseNAME: _________________________________DATE: _________LASTFIRSTResearch Question: What household electronics consume the most electricity and what are their costs?Background: Electrical power is measured in Watts. Electrical power is equivalent to voltage multiplied by the current. P = I x V ‐OR‐ Power (Watts) = Current [measured in Amps] x Voltage (V) We use lots of power to charge and operate all of modern appliances and devices. For that reason, total power is measured in kilowatts (1000 W = 1 kW.) When you get an electricity bill, the company usually charges in kilowatt-hours (kWh). If you use 1 kW of electricity for 1 hour, you have just used 1 kWh. If you use 2 kW for 1 hour, you used 2 kWh. Burning coal produces most of the electricity in the US. It takes roughly 1 pound of coal to produce 1 kW-hour of electricity. There are about 2000 pounds in a ton. So that means we get about _________kW-hours from 1 ton of coal.Some appliances even draw electricity when turned off. These are called “Phantom” appliances because like Dracula, they consume electricity even when off. In this lab we will calculate the amount of electricity used by different electronics in our life. We will calculate the annual (yearly) cost of each device and detect whether or not it uses electricity when turned off.Based on the above reading, describe two ways electrical power (watts) can be increased. The light bulb in my garage draws 100 Watts when turned on. How many kiIowatts does it use?I use this bulb for 10 hours per day, everyday for a year (365 days) Calculate the number of kilowatt-hours that this bulb uses in a day and a year. Clearly show work.If electricity costs $0.12 per kilowatt-hour, how much does this bulb cost me each year? Show work.Hypothesis: Of the devices in your life, which do you think will be the largest consumer of electricity? Why? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Data Collection (please attach a sheet of paper with all of your work shown.)Electrical DevicePredicted Watts * see plugActual Watts (when running)Kilowatts when runningAverage hours used per day kWh per yearCost per year ($)Tons of Coal per yearWatts when turned offCost per year when offMacBookRefrigerator *************Cubic Ft= ________ Data Analysis: What are the top three electricity consumers? Do they have anything in common?What appliances used the least energy? Do they have anything in common? Some appliances state the wattage on the back. This number may not match the meter reading from your experiment. Why do you think this may happen? Conclusion (on separate sheet of paper)What additional appliances do you think are the biggest consumers of electricity in your house? Why? Research the “Energy Star” rating for appliances and devices. Are any of the devices tested “Energy Star” certified? How does this affect a devices’ electricity consumption?We all know that turning off a device or light will save electricity, but what are 3 other ways your family can save electricity? ................
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