# PPT - Electrical Energy Consumption: Power and Energy...

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Number of Views:619 Avg rating:3.0/5.0 Slides: 18 Provided by: EMal1 Learn more at: http://webapps.hcdsb.org Category: Tags: consumption | dryer | electrical | energy | power more less Write a Comment User Comments (0) Cancel OK OK Latest Latest Highest Rated Sort by: Latest Highest Rated Page of Transcript and Presenter's Notes Title: Electrical Energy Consumption: Power and Energy 1 Electrical Energy Consumption Power and Energy 12.7 Power Electrical power is the rate at which electrical energy is produced or consumed during a given period of time. Power is measured in watts (W). Energy Energy is measured in joules (J). Since the joule is a small unit of energy,

electrical energy usage is usually measured in kilowatthours (kWh). Electrical power kilowatthour 2 Calculating Power PE/t Power (P) is measured in watts (W) Energy (E) is measured in joules (J) Time (t) is measured in seconds (s) Example What is an iPods power in watts if it was on for 1.30 h and used 210 000 J of electrical energy? Given t 1.30 h x 3600 t 4700s E 210 000 J 3 Required P ? Analysis P E / t Solution P 210 000 J / 4700 s P 45 W Statement Therefore, the iPods power is 45 watts.

4 Electrical Energy Consumption Efficiency 12.7 Some electrical devices use less electrical energy to do a task than other devices. The efficiency of a device is a measure of how much useful energy the device produces compared with the amount of energy that the device uses. The more efficient the device, the less electrical energy it requires to do a particular task. efficiency 5 Electrical Energy Consumption Efficiency 12.7 Many major appliances have energy usage stickers (EnerGuide labels) that indicate how much electrical energy the device uses during one year. The kilowatthour ratings on EnerGuide labels are based on the average Canadian household use. Energy Star appliances are the most energy-efficient. 6 Electrical Energy Consumption Energy Conservation 12.7 We all have the responsibility to use less energy. There are many ways to conserve energy. Use more efficient devices. For example, use the EnerGuide and Energy Star labels on major

appliances to make an informed decision when making a purchase. Only buy and use devices that are necessary. For example, an electric kettle, breadmaker, and rice cooker are appliances that are not necessary if you have an energy-efficient stove and oven. Maximize the use of an appliance when you use it. For example, wash only full loads of clothes in a washing machine. 7 Calculating the Efficiency of a Device You can calculate the percent efficiency of a device using the equation percent efficiency energy out x 100 energy in efficiency E out x 100 E in 8 SAMPLE PROBLEM 1 A light bulb uses 100 J of electrical energy and produces 35 J of light energy. Calculate the percent efficiency of the light bulb. Given E out 35 J E in 100 J Required percent efficiency ( efficiency) 9

Analysis efficiency E out x 100 E in Solution efficiency 35 J x 100 100J efficiency 0.35 x 100 efficiency 40 Statement The efficiency of the light bulb is 40. 10 SAMPLE PROBLEM 2 A toaster oven uses 1200 J of energy to produce 850 J of thermal energy. Calculate the percent efficiency of the toaster oven. Given E in 1200 J E out 850 J Required efficiency ?

Analysis efficiency E out x 100 E in Solution efficiency 850 J x 100 1200 J efficiency 70.8 or 71 Statement The efficiency of the toaster oven is 71. 11 12 Calculating the Cost of Operating an Electrical Device The cost of operating an electrical device can be calculated using the equation cost to operate power used x time x cost of electricity 13 SAMPLE PROBLEM 1 A laptop computer uses a 75 W adapter when it is plugged in. Electricity costs 5.6 /kW.h. Calculate how much it would cost to operate the laptop for 1 year for 24 hours per day. Given power 75 W (converted to kW 75 W x 1 kW 0.075 kW) 1000 W

time 24 hours per day for 365 days 8760 hours cost of electricity 5.6 /kW.h Required cost to operate Analysis cost to operate power used x time x cost of electricity 14 Solution Cost to operate 0.075 kW x 8760 h x 5.6 kW.h Cost to operate 3679 or 3700 Statement It would cost 3700 (or 37.00) to operate a laptop computer for 24 hours per day for 365 days. 15 SAMPLE PROBLEM 2 Calculate the cost of operating a 1500 W hair dryer to dry your hair for 6 minutes per day for 3 days. The cost of electricity is 5.6 /kW.h. Given power 1500 W (converted to kW 1500 W x 1 kW 1.5 kW) 1000 W time 6 minutes per day for 3 days

6 min x 1 h x 3 days day 60 min 0.3 hours cost of electricity 5.6 /kW.h 16 Required cost to operate Analysis cost to operate power used x time x cost of electricity Solution Cost to operate 1.5 kW x 0.3 h x 5.6 kW.h Cost to operate 2.52 or 3 Statement It would cost 3 to operate your hair dryer for 6 minutes per day for 3 days. 17 HOMEWORK pg 535 1 - 7 About PowerShow.com PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun,

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