Activity: Measuring the Power Rating of Electrical Devices
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SVN3M - Energy
Activity: Measuring the Power Rating of Electrical Devices Measure the power ratings for the following devices when in use, and in standby mode where appropriate.
Device Power When in Use (W) Power When in Standby (W) Christmas lights
Lamp, incandescent light bulb
Lamp, compact fluorescent bulb
Night light
Iron
VCR
TV
Cellphone charger
DVD player
Laptop computer
Microwave oven SVN3M - Energy
Questions for Toronto Star Article: “The Big Drain” (January 2008) 1. Over a year, the standby power that is used by your appliances could run a refrigerator for how long?
2. Who is proposing the new regulations on standby power for CD and DVD players and other appliances?
3. When the new requirements are finally implemented, the savings in energy would be equivalent to taking about how many homes “off-the-grid”? What does “off-the-grid mean?
4. Why are televisions being targeted for the new standards first?
5. What are 3 ways described in the article by which we can save standby power?
Use the provided table “Standby Power for Selected Devices” and list 8 devices from the table that you have at home. Write down the standby power in column 2 (in Watts, W), and multiply the standby power by 24 hours to get the energy use in 1 day for the device if it was kept in standby mode. Then add up the last column and divide by 1000 to get the number of kilowatt hours of energy used by devices in standby mode per day. (Remember the average household uses about 35 kilowatt hours per day.) Device Standby Power/Minimum Energy Used Per Day (Standby Power Power (Watts) × 24 hours = ? Watt-hours) 1. 2. 3. 4. 5. 6. 7. 8. Add together everything in column #3 Divide the above row by 1000 to get kilowatt hours (kWh) SVN3M - Energy
Standby Power for Selected Devices
Product/Mode Average (W) Min (W) Max (W) Charger, mobile phone
On, charged 2.24 0.75 4.11
On, charging 3.68 0.27 7.5
Power supply only 0.26 0.02 1
Clock, radio
On 2.01 0.97 7.6
Computer Display, CRT
Off 0.8 0 2.99
On 65.1 34.54 124.78
Sleep 12.14 1.6 74.5
Computer Display, LCD
Off 1.13 0.31 3.5
On 27.61 1.9 55.48
Sleep 1.38 0.37 7.8
Computer, desktop
On, idle 73.97 27.5 180.83
Off 2.84 0 9.21
Sleep 21.13 1.1 83.3
Computer, notebook
Fully on, charged 29.48 14.95 73.1
Fully on, charging 44.28 27.38 66.9
Off 8.9 0.47 50
Power supply only 4.42 0.15 26.4
Sleep 15.77 0.82 54.8
Phone, cordless
Ready, handset 2.81 1.05 4.89
Ready, no handset 1.58 0.59 3.09
Active (talking) 1.9 0.59 3.38
Off 0.98 0.54 1.8 SVN3M - Energy
Printer, inkjet
Off 1.26 0 4
On 4.93 1.81 22
Speakers, computer
On, no sound 4.12 0.69 9.84
Off 1.79 0 5.6
Television, CRT
Off by remote 3.06 0.3 10.34
Off by switch 2.88 0 16.1
Clock
On 1.74 0.99 3.61
Radio playing 2.95 1.7 4.2
Coffee Maker
Off 1.14 0 2.7
DVD/VCR
On, not playing 13.51 8.48 20.5
On, playing 15.33 9.43 22.37
Off 5.04 0.09 12.7
Game Console
Active 26.98 5.4 67.68
Off 1.01 0 2.13
Ready 23.34 2.12 63.74
Microwave Ovens
Ready, door closed 3.08 1.4 4.9
Ready, door open 25.79 1.6 39
Cooking 1433. 966.2 1723.
All data from Lawrence Berkeley National Laboratory, http://standby.lbl.gov/summary- table.html, accessed February 2011