View
1
Download
0
Category
Preview:
Citation preview
Arn
e H
ücke
lhe
im,
“Pu
mp
jacks”
Ma
y 1
6,
20
09
, C
rea
tive
Com
mo
ns A
ttri
bu
tio
n.
Activity: Hot Bulbs Activity: Hot Bulbs
LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers
currently teaching the Science and Global Issues SEPUP course to customize the unit to match
their students’ learning levels or to insert additional teaching aides. Modified slides may be used
only by the modifying teacher in his or her classroom, or shared with other teachers of Science
and Global Issues within the teacher’s school district, with these same restrictions. Modified slides
may not be taken out of the classroom or distributed to any non-student person or organization.
Except for use with students in the classroom, modified slides may not be published in printed or
electronic form, including posting on the Internet. Only text may be modified: photographs and
illustrations on the slides may not be modified in any way except to change their size.
DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
(“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages,
fees or other liability, nor for any direct, indirect, special, incidental or consequential damages
(including lost profits) with respect to any claims by the purchaser or user of Science and Global
Issues or any third party on account of or arising from the use or modifications to the slides. Client
acknowledges and accepts that University services are provided on an as-is basis.
Activity: Hot Bulbs Activity: Hot Bulbs
When you turn on a light bulb, what kinds of energy are being produced?
How can we compare the amount of each kind of energy produced?
Watts and calories are units used to measure energy: 860 cal per hr = 1 watt
Get
Started
Activity: Hot Bulbs Activity: Hot Bulbs
Yazmin noticed that after turning off a light, the bulb was hot to the touch. While some of the bulb's energy was converted to light energy, some was converted to heat. How much of the energy is 'lost' as heat?
Or, what is the efficiency of the bulb?
Read the introduction.
Introduction
Activity: Hot Bulbs
Challenge
What is the efficiency of a light bulb?
Challenge
Activity: Hot Bulbs
Procedure
• After setting up the procedure, keep track of your data using that data tables for part A.
Activity: Hot Bulbs
Procedure
Energy released (cal.) = temperature change (ºC) x mass of water (mL)
Energy absorbed (cal.) = time lit (minutes) x 27 calories per minute
Thermal energy output (%) = TEr/ TEax 100%
Light efficiency (%) = 100% - thermal energy output
For part B, you’ll need a second data table
Activity: Hot Bulbs
Follow Up
• Are light bulbs better at producing light or heat?
• Do you think inefficiency is a bigger concern in warm climates or cold ones?
An incandescent,
compact fluorescent,
and halogen bulb
Activity: Hot Bulbs
Follow Up
• Looking at the table below, which type of light bulb do you think is best?
• Most people buy incandescent bulbs. Why do you think this is?
Activity: Hot Bulbs Activity: Hot Bulbs
• Control
• Efficiency
• Incandescent
• Fluorescent
• Watt
Key
Vocabulary
Activity: Hot Bulbs
Key
Vocabulary
• Efficiency is the ratio of useful energy that is released by a process to the total energy absorbed by the process.
• Energy is the ability to cause objects to change, move, or work.
• Circuit is a path along which electrical energy can transfer
Activity: Hot Bulbs Activity: Hot Bulbs
Texas Essential Knowledge & Skills (TEKS)
§112.18. Science, Grade 6, Beginning with School Year 2010-2011.
(a)(4)(C) ... Thermal energy can be transferred by conduction, convection, or radiation. It can also
be changed from one form to another. Students will investigate the relationship between force and
motion using a variety of means, including calculations and measurements.
(c)(9) Force, motion, and energy. The student knows that the Law of Conservation of Energy
states that energy can neither be created nor destroyed, it just changes form. The student is
expected to:
◦ A) investigate methods of thermal energy transfer, including conduction, convection, and
radiation;
◦ (B) verify through investigations that thermal energy moves in a predictable pattern from
warmer to cooler until all the substances attain the same temperature such as an ice cube
melting; and
◦ (C) demonstrate energy transformations such as energy in a flashlight battery changes from
chemical energy to electrical energy to light energy.
TEKS ADDRESSED
Activity: Hot Bulbs Activity: Hot Bulbs
MS-PS3-4. ◦ Plan an investigation to determine the relationships among the energy
transferred, the type of matter, the mass, and the change in the average
kinetic energy of the particles as measured by the temperature of the
sample.
NGSS ADDRESSED
Recommended