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Cool Activities
What is PRECYCLING?
- Stopping waste before it happens
- Preventing waste at its source
- Reducing the amount of waste we produce,
MAKING LESS GARBAGE!
Using Recharageble Batteries is a great way to Precycle!
Does precycling save?
The city of Electropolis uses batteries for many of their portable power needs. Will using rechargeable batteries help save the citizens of Electrolpolis money and reduce trash?
 Talkin’ Trash !
Using the following information, figure out what would the weight of all AA size the batteries thrown away each year in Electropolis.
- Number of people who live in Electropolis = 50,000
- Number of AA size batteries thrown away each year per person = 30
- Weight of an average AA size battery = 0.85 ounces
- One pound = 16 ounces
- One ton = 2,000 pounds
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Questions |
Answers |
| A |
Total number of batteries thrown away each year in Electropolis
answer = 50,000 x 30
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1,500,000 batteries |
| B |
Weight of batteries thrown away each year in ounces
answer = A x .85
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1,275,000 ounces |
| C |
Weight of batteries thrown away each year in pounds
answer = B / 16
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79,688 pounds
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| D |
Weight of batteries thrown away each year in tons
answer = C /2000
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40 tons |
How much is that ?
It’s hard to imagine the weight of the batteries thrown away in Electropolis!
Answer the questions below to convert the weight of the batteries to objects that are easier to imagine.
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Questions |
Answers |
| E |
An elephant weights 5 tons.
How many elephants would it take to equal the weight of the batteries?
answer = D / 5
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8 elephants |
| F |
If a man weights 235 pounds, how many men would it take to equal the weight of the batteries?
answer = C / 235
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339 men |
Discard or Recharge ?
An Electropolis radio uses AA eight batteries. Regular alkaline batteries last for four hours and cost $10.00 for a set of eight. Rechargeable batteries last for 54 hours (with recharging) and cost a total of $50.00 for eight batteries including the Charger to recharge them.
Is it less expensive to buy the single-use alkaline or the Rechargeable batteries?
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Questions |
Answers |
| G |
The cost per hour to use the rechargeable batteries is ?
answer = $50 / 54
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$.93 |
| H |
It will take 13.5 sets of single-use batteries to equal 54 hours.
How much will 13.5 sets of single-use batteries cost ?
answer = 13.5 x $10
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$135.00 |
| I |
The cost per hour to use the single-use batteries is ?
answer = H / 13.5
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$2.50 |
| J |
What is the difference in cost per hour for single-use and rechargeable batteries?
answer = I - G
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$1.57 |
| K |
Which cost less per hour, single-use or rechargeable batteries ?
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Rechargeable Batteries |
Does Precycling Save?
If Electropolis were to switch from single-use to rechargeable batteries would they save?
Assume a single-use and rechargeable battery weigh the same.
Use the answers from above to help figure out the following questions:
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Questions |
Answers |
| L |
How many hours of single-use battery life is used before the batteries are throw away?
answer = A * 4
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6,000,000 hours |
| M |
How many sets of single-use batteries does Electropolis throw away a year?
answer = A / 8
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187,000 sets |
| N |
How many rechargeable batteries are needed to meet Electropolis's battery usage needs?
answer = L / 54
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111,111 batteries |
| O |
How many sets of rechargeable batteries are needed to meet Electropolis's battery usage needs?
answer = N / 8
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13,889 sets |
| P |
How many batteries are saved if Electropolis uses rechargeable batteries?
answer = A - N
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1,388,889 batteries |
| Q |
How many ounces of trash would be saved if Electropolis used rechargeable batteries?
answer = P x .85
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1,180,556 ounces |
| R |
How many pounds of trash would be saved?
answer = Q / 16
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73,785 pounds |
| S |
What is the total cost of using single-use batteries to meet Electropis's battery usage needs?
answer = L * $10
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$1,870,000 |
| T |
What is the total cost of using rechargeable batteries to meet Electropis's battery usage needs?
answer = N * $50
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$694,450 |
| U |
How much money would be saved if rechargeable batteries would be used?
answer = S - T
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$1,119,994 |
| V |
Does Precycling save?
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Yes! |
YES, PRECYCLING SAVES!
- Precycling would save 73,785 pounds - that weighs as much as 37 elephants!
- Precycling would save the citizens of Electropolis over one million dollars!
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