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Power Rating of Appliances
A WebQuest For Science and
Technology IV
Designed by
Teresita L. Garay
vincihope@gmail.com
Introduction
This lesson aims that the students will apply their
knowledge on energy consumption. It is hoped that
that the learners will be encouraged to monitor their
electrical energy consumption as a guide to electrical
energy consumption and even develop the value of
thriftiness.
In this webquest, we will find out how to relate power
rating of appliances to voltage and current and even
how to calculate its power rating of the appliance and
interpret correctly the manufacturer’s label on
appliances. Do this webquest to find out how.
The Task
In this webquest you will investigate common
appliances found at home and find out how it
works. Working in groups, you will study how this
power rating of appliances can be observed, You
will present this information, including
illustrations (drawings or photos), in the form of a
report or in power point presentation.
We will then submit your reports to the Philippine
Physics Society so that they can use it in their
science promotion activities.
The Process
What you are expected to do in this webquest is
not as difficult as it sounds. Just follow the steps
below.
1. Your teacher will form you into groups of four or
five members. Each group member will have a
special role to play. Once you know who your
group mates are, agree among yourselves on who
will play which role. Be sure that each one chooses
the role that is most suited to him/her (in terms of
his/her abilities and interests). The roles are as
follows:
Role Responsibility
Researchers Find the data of the five group mates on their electrical appliance found at
(2 members) home.
In tabular form fill up the column for Appliances, Power (W), Voltage (V),
Current (A) and Fuse (A)
Reporter Get information from the data gathered by the recorder
(2 members
Leader Consolidate all the data gathered
(1 member
Graphic Collect photographs of the different appliances with its power rating.
Designer Place the photos and/or drawings in the correct parts of the report
(1 member (there should be at least 1 photo/drawing per part), and provide the
appropriate caption for each
Brainstorm on where you can get the data about the Power
Rating of Appliances assigned to your group.
.
2. Do the background research for this project by
reading the websites listed in the resources
section. In this step of the project you will find out
about Power Rating of Appliances in general,
including the significance of the equation P=VI.
You have three days to do this step.
3. Now that you know the Power Rating of Appliances,
do research on how this power rating of appliances
relates to voltage and current, how do these can be
calculated. Sources of data are taken from:
Household appliance of the five members of the group
Since you are writing one report, it is best that you
work together in doing this step. You can support each
other and avoid irritating your sources with several
visits from different members of the group.
Remember to collect photos as well. And if one of you
can make good drawings, these will serve as very good
illustrations for certain parts of your group report.
You have three days to gather data assigned to your
group.
4. Meet as a group and share and discuss the
information gathered.
5. Write the group report. That is, members should
write the specific sections assigned to them. Be guided
by the scoring guidelines given in the evaluation.
It is also at this point that you shall choose which
photos and/or drawings to include in your section of
the report.
Everyone has two days to finish the draft of the
sections assigned to them.
6. Meet again as a group to:
review each other’s drafts and suggest improvements
make the necessary improvements on your sections as suggested
by the other group members
encode the text of the different sections (using MS Word or
StarOffice word processing software) and scan the photos
put together the group report
This step will probably take one whole day, with the encoding
and scanning of photos taking place in the computer lab. Your
teacher can schedule one Saturday during which all groups will
work together in the computer lab.
Submit your report to your teacher
7.
on the due date.
Fill in the evaluations forms and
8.
submit these to your teacher on the
due date.
Resources:
http://howto.altenergystore.com/Reference-
Materials/Power-Ratings-typical-for-Common-
Appliances/a21/
http://www.csupomona.edu/~pbsiegel/www/s
ci210/appliances.pdf
http://courses.washington.edu/engr100/All_Se
ctions/Wiring/basic_electricity.pdf
Evaluation
Yes Partly No
Item 2 1 pt 0
pts pt
A. Power Rating of the Appliances
Your group report will be evaluated using the following scale:
1. Power rating of appliances relates to voltage and
current
2. Power rating of the appliances can be calculated.
3. Is the manufacturer label can be correctly interpreted?
4. Is there at least one photo of the appliance with power
rating?
The prefect score for the group report is 30
points. Group members will of course receive
the same grade so you must take an interest in
each other’s work on the different parts of the
group report. In other words, do not be
concerned only about your part of the report.
Your individual final grade for the project will
be computed from your score for the group
report (to account for 70% of the project grade)
and your score for the self-assessment and
peer evaluation (15% each of the project
grade).
