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Batteries and Bulbs. Discover and Record how a battery can be used to light a bulb.

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Presentation on theme: "Batteries and Bulbs. Discover and Record how a battery can be used to light a bulb."— Presentation transcript:

1 Batteries and Bulbs

2 Discover and Record how a battery can be used to light a bulb.

3 Two students, Wayne and Bill were discussing a recent flashlight purchase. “I love the Mag-Lite flashlights and last night I purchased one,” said Wayne. “I couldn’t decide whether to buy the one that uses two D-cell batteries or the one that uses two C-cells. I chose the one that uses C-cells because I noticed that the batteries only cost 75 cents while the D-cells were one dollar a piece,” “That was silly,” said Bill, “The D-Cells are so much bigger and so that flashlight would be so much brighter. You’ll pay less for the batteries but the light will be so much dimmer than if you used D-cells.” “I think the different batteries would create equal brightness in the bulbs,” says Wayne, “all of the batteries say 1.5 V on the side. Shouldn’t they be the same brightness if they have the same number on the side?” Which student do you think is making the most sense? Bill who says the D-cell batteries will make the bulb shine brighter, or Wayne who thinks they will have the same brightness? Support your answer. D-cell vs C-cell Batteries

4 Does the C or the D cell cause a single light to be lit brighter? Can either cell light more than one bulb?

5 In what ways are the cells different? In what ways are they the same?

6 What about combining batteries

7 Short Circuit Never let a conductor touch both terminal leads

8 Be sure there is at least one bulb between the terminals

9 What is it about the battery that allows only a certain number of bulbs to be lit?

10 D-Cell C-Cell In what ways are the two cells different?

11 C vs D cell Power

12 Work Done by C and D Cells

13 What about AA-cells and AAA-cells?

14 Power for AA vs AAA

15 Work Done by AA vs AAA

16 D-Cell C-Cell AA-Cell AAA-Cell So What’s the Dif?

17 Two students, Wayne and Bill were discussing a recent flashlight purchase. “I love the Mag-Lite flashlights and last night I purchased one,” said Wayne. “I couldn’t decide whether to buy the one that uses two D-cell batteries or the one that uses two C-cells. I chose the one that uses C-cells because I noticed that the batteries only cost 75 cents while the D-cells were one dollar a piece,” “That was silly,” said Bill, “The D-Cells are so much bigger and so that flashlight would be so much brighter. You’ll pay less for the batteries but the light will be so much dimmer than if you used D-cells.” “I think the different batteries would create equal brightness in the bulbs,” says Wayne, “all of the batteries say 1.5 V on the side. Shouldn’t they be the same brightness if they have the same number on the side?” Which student do you think is making the most sense? Bill who says the D-cell batteries will make the bulb shine brighter, or Wayne who thinks they will have the same brightness? Support your answer. D-cell vs C-cell Batteries

18 Type of Battery Cost of Battery Energy Provided (Joules) Energy Provided (W-h) Energy Provided (kWh) Cost per kWh D cell$1.5861, $92.07 C cell$1.5032, $ AA cell$0.589, $ AAA cell$0.713, $781.51

19 $ ¢ per kWh!

20 How much does it cost to toast a bagel? Typical Toaster Power = 1,000 Watts Time = 3min = 180 sec Energy = Power x Time = 180,000 Joules = 0.05 kwH Com Ed rate 7¢ / kWh Cost = 0.05kWh x (7¢ / kWh) Cost = 0.35¢

21 How much does it cost to toast a bagel? 0.35¢ = $ x $1.58 = $ x $1.50 = $ x $0.58 = $ x $0.71 = $27.69


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