Transcript non-renewable

What’s Wrong With This Picture?
What’s Wrong With This Picture?
What’s Wrong With This Picture?
What’s Wrong With These
Statements?
• Hal says that his teacher is solely responsible for
preventing laboratory accidents.
• Keshia started the lab activity before reading it through
completely.
• Ricardo decided to do a lab activity that he read about in
a library book before the teacher came into the
classroom.
• Stephanie says that the safety goggles mess up her hair
and give her raccoon eyes. She refuses to wear them.
• Barbie and Ken accidentally break a beaker full of some
chemical. Instead of risking getting in trouble they
quickly clean up the mess with paper towel and throw it
in the garbage.
What NOT to do in the laboratory!
Science Safety Poster
• Design a rough draft of a science safety poster
on loose leaf. Your draft must cover the full
page. Once your rough draft has been
approved move to the next step.
• Draw in pencil on 11 x 17 paper your science
safety poster. This design must be neat and
coloured. Place you name on the back of your
poster
The Potato Battery
Purpose:
To demonstrate how a potato and different metals can be used
to power various materials.
Hypothesis:
Do you believe that a potato can be used to produce an electric
current? How much current do you think a potato will produce?
For how long do you think it will be able to sustain a current?
Could you use one of them to power a clock or a calculator?
Apparatus:
• alligator clips,
• device to power (ie. clock, calculator, light bulb, etc.),
• wire
Materials:
copper,
zinc (galvanized nails),
potatoes
Procedure:
1. Cut the potato in half and place them next to each other,
flat face down on a plate.
2. Strip off about 2 inches of insulation from both ends of
each wire.
3. Wrap one end of one wire around one of the nails. Press
the nail into one of the potato halves.
Diagram:
Wire attachment to nail and
copper
Potato battery set-up
Potato clock set-up
galvanized nail
copper
wire
clock
potato
Potato powered calculator set-up
galvanized nail
copper
wire
potato
calculator
Results:
The timer works! Initially, the potato battery consisted of
4 potatoes. This produced too much electricity. Both the
calculator and the timer showed all 8’s. When the potato
battery was reduced to 2 potatoes, just the right amount
of energy was produced, allowing both the calculator and
the timer to work efficiently.
Conclusion:
The number of potatoes affects the amount of
energy produced. When the potato battery is
connected in series, the more potatoes added,
increases the voltage. When connected in
parallel, the more potatoes added increase the
amperes. The voltage produced here is about that
of a AA or AAA battery – ie. about 1.5V. However,
students must keep in mind that voltage only has
the potential to do work. (This deals with Ohm’s
Law: V = I x R). This type of battery only produces
a few milliamps. Many potatoes are needed to
produce enough amps to make a significant
difference.
Lights-On Lights-Off Centre
Purpose: Determine which materials allow
electricity to pass through them.
Materials:
metal spoon, AA battery, piece of wood,
quarter, sharpener, straw, light bulb,
eraser, 3 alligator clips
3. Hypothesis:
Materials
metal spoon
wood
quarter
sharpener
eraser
straw
Prediction
Result
4. Diagram:
light bulb
quarter
6 Volt
wires
battery
6. Conclusion:
• 1. What material would you use to
make a light bulb go on- a conductor
or an insulator?
• 2. Based on your investigation which
materials would make good
conductors?
• 3. Describe a situation where an
insulator is used in an electrical
device?
Different Needs, Different Circuits
• Purpose: to build series and parallel circuits.
• Materials: 2 light bulbs with holders, 6 alligator
clips, 1 AA battery.
• Diagram:
Series Circuit
Parallel Circuit
Conclusion:
1. Give examples of similarities between a series and a
parallel circuit. Give examples of differences between a
series and a parallel circuit.
2. Why do you think the two light bulbs go out when one
light bulb was unhooked in the series circuit?
3. Why do you think one light bulb stayed on when the
other light bulb was unhooked in the parallel circuit?
4. Can you describe a situation where a series circuit
could be used to operate an electrical device?
5. Can you describe a situation where a parallel circuit
could be used to operate an electrical device?
Where Does Electricity
Come From?
A + and – chart can also be used for collecting science
information. You are going to read about five different
ways to generate electricity. Each way has positive and
negative effects on your community and the
environment. Create a + and – chart for the different
ways to generate electricity.
There are two major categories for classifying types of
energy resources — renewable and non-renewable. A
renewable energy resource can be used over and over. It
is never used up. Hydroelectricity, wind, and solar energy
are examples of renewable energy resources. A nonrenewable energy resource can only be used once. Coal is
an example of a non-renewable energy source.
Renewable
and Non-Renewable Energy Resource
• A renewable energy resource can be used over and
over. It is never used up.
• A non-renewable energy resource can only be used
once.
Hydroelectricity
Positive
Negative
Hydroelectricity
Positive
Negative
• No pollution
• Renewable
• Can be used for recreational
purposes
• Farm irrigation
• Can destroy ecosystems and
agriculture
• Can only be built in certain
areas
• Expensive to build
Solar Energy
Positive
•
•
•
•
Used to heat water
Used anywhere sun shines
No pollution
Easy to install
Negative
• Only sunny for part of the
day
• Expensive to buy solar
panels
• Takes up space
Wind
Positive
•
•
•
•
Free
No pollution
Renewable
Set up fast
Negative
• Wind speed vary
• Can kill birds
• Turbines break down
Nuclear
Positive
• Uranium is found almost
everywhere
• No air pollution
• Cheap to operate
Negative
• Dangerous to environment
• 100 years of uranium left
• Expensive to build nuclear
power plant
Poster or Essay
Coal
Positive
• There is a lot of coal
• Other products made from
it
• Cheap to mine
Negative
•
•
•
•
Hard to mine
Dangerous to mine
Harmful to environment
Pollution