Transcript
Science 9 Assignment – Power, Energy and Cost Power 1. A vacuum cleaner has a power rating of 500W when used in your house. What is the current drawn when it is used? 2. How much current is drawn by a 1100W toaster? 3. A water pump is used to pump water in your house. If it has a power rating of 1200W when connected to a 240V supply determine the current draw. 4. An LCD projector used in a classroom is rated at 300W. What is the current draw? 5. How much current would a 90 W ceiling fan draw?
For the following questions determine the power and the possible tool or device used based on the table below. Show your work. 6. A tool is used for construction and draws 6.25A. 7. A tool used for construction draws 11.67A. 8. A tool used in the yard draws 3.75A. 9. The electric version of this yard tool draws about 9.2A.
Energy
(Show your work and give your answer in kWh – remember to divide by 1000)
10. Determine the energy used by a cable box used for 12 hours. 11. How much energy is used by a light that has 3 – 50W incandescent light bulbs that are used for 6 hours? 12. A clothes dryer is used for 3 hours. Determine the energy used. 13. A LCD TV is used for 6 hours. How much energy is used? 14. How much energy is used by a dishwasher that is used for 90 minutes?
Cost 15. Determine the cost to use the items in questions 4,5,6, 12 and 13. 16. How much money would you spend on energy to run 4 – 40W lightbulbs for 3 hours a day for one year. 17. How much would you spend on energy if you switched your 40W bulbs to CFL bulbs rated at 13 W?
Bonus – use the knowledge you have now to attempt the questions below if you want to try them. You are not required to do 18-21 18. An AAA-cell alkaline battery has a voltage of 1.5V and is rated at 1150mAh. Determine the energy stored in the battery. 19. A D-cell alkaline battery has a voltage of 1.5V and is rated at 17000 mAh. Determine the energy stored in the battery in kWh. (Remember to change mAh to Ah by dividing by 1000) 20. A C-cell alkaline battery has a voltage of 1.5V and is rated at 7800mAh. Determine the energy stored in the battery. 21. An AA-cell alkaline battery has a voltage of 1.5V and is rated at 2100mAh. Determine the energy stored in the battery.
Appliance Central Air Conditioner NA Electric Clothes Dryer NA
Watts
Appliance
Watts
Appliance
Watts
5,000
Electric blanket
200
Hedge trimmer
3,400
Shaver
15
Weed eater
500
Oven
3,000
Waterpik
100
1/4” drill
250
Hair Dryer
480-1200
1/2” drill
750
Dishwasher
1,538 12001500
60-250
1000
Coffee Machine
1,500
Plasma TV
339
Microwave
1,500
LCD TV
213
Popcorn Popper
1,400
25” color TV
150
1” drill 9” disc sander 3” belt sander 12” chain saw
Toaster oven
1,200
19” color TV
70
14” band saw
1100
Hot Plate
1200
12” black and white TV
20
7-1/4” circular saw
900
Iron
1,100
Stereo
10 to 30
8-1/4” circular saw
1400
Toaster
1,100
Satellite dish
30
Refrigerator/ Freezer**
Microwave
5001500
Radiotelephone - Receive
5
20 cu. ft. (AC)
1411 watthours/day*
1,100
Radiotelephone - Transmit
40-150
16 cu. ft. (AC)
1200 watthours /day*
Room Air Conditioner NA
Well Pump (1/3-1 HP) Laptop
450
1200 1000 1100
500
LIghts
Freezer
479
100 watt incandescent bulb
100
15 cu. ft. (Upright)
1240 watthours /day*
450
25 watt compact fluor. bulb
28
15 cu. ft. (Chest)
1080 watthours /day*
Espresso Machine
360
50 watt DC incandescent
50
Cell Phone recharge
2-4 watts
Dehumidifier
350
40 watt DC halogen
40
MP3 Player recharge
.25-.40 watts
Vacuum Cleaner
Water heater Sink Waste Disposal
Appliance
Watts
Appliance
Watts
Video Game Player
195
Standard TV
188
Monitor
150
20 watt DC compact fluor. CFL Bulb (60watt equivalent) CFL Bulb (40watt equivalent) CFL Bulb (75watt equivalent) CFL Bulb (100-watt equivalent)
Computer
120
Heaters***
Portable Fan
100
Engine Block Heater NA
Ceiling Fan
100
Portable Heater NA
1500
Can Opener
100
Waterbed Heater NA
400
Curling Iron
90
Stereo
Blender
Humidifier
300
300-1000
22
18
11
20
30
150-1000
60
Stock Tank Heater NA Furnace Blower
300-1000
Cable Box
20
Clothes Dryer - Gas Heated
300-400
Clock Radio
7
Well Pump (1/3-1HP)
100
480-1200
