Name: ___________________________________
Name: ___________________________________
Name: _______________
LIGHT BULB WORKSHEET

Conserving the amount of energy we use is often suggested as an important way people can combat things like acid rain and global warming. It is also an excellent way to combat the high cost of living. The use of Light Emitting Diode (LED) bulbs is often touted as one way to cut energy use. These bulbs are not the strip lights you have seen in school building and stores. LED bulbs are the size of a normal light bulb but have a type of covering over the bottom part of the bulb (see images below).

To find out the impact the choice of bulb has on the amount of electricity we use save this worksheet to your computer as a Word Document. The complete the following activity noting that you will post some of the data to the Question and Answer forum on the class web site by Friday of this week.:

Visit Wal-Mart, Lowes, or ACE and find both of the following:

1. A box of normal (incandescent) soft white light bulbs. These must be 60W, medium base, soft white bulbs
. They may be general purpose or 2X (long life) bulbs
. Make sure that they are general lighting bulbs and not 3 way, fan, or any other color bulbs.

2. A box of LED bulbs that are the equivalent of 60W.
Make sure that they are general lighting bulbs and not 3 way, fan, or dimmable bulbs.

The LED bulbs will look like this: The normal light bulbs look like this:

You must find a LED that produces the equivalent light of a 60 watt normal incandescent bulb.

Note that the life of some bulbs is given as “year life”. For example 1.4 year life.
Each “year life” is equivalent to 3 hours per day for 365 days. 3 x 365 = 1095 hours. So, to convert “year life” into hours you will need to do the following: year life x 1095 = life of the bulb in hours.

Once you have found your 2 boxes of bulbs you
do not need to buy them.

Take 2 photos with each item; One showing you with the item, and one close enough so that it shows the price and the information shown on its box. Attach (paste/insert them into the Word document) the photos to the end of this worksheet.

Read the light bulb box and use the information provided to complete the table on the next pages.

LIGHT BULB WORKSHEET RESULTS

SHOW ALL CALCULATIONS

A

Price of one 60 Watt normal incandescent light bulb (not the pack just one bulb!) .

$

B

Life time of the bulb in hours. Convert life in years to life in hours if needed. Ask me for help if you have not procrastinated

hrs

C

Price of one LED bulb

$

D

Life time of the LED bulb in hours. Convert life in years to life in hours if needed. See me for help if you have not procrastinated

hrs

E

How many normal bulbs would you have to buy to cover the life of one LED bulb?

F

The Total cost of all the normal bulbs calculated in E would




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