Tuesday, 27 August 2013

Different types of energy

Answer Key
Blue = work done in class
Black = narration



Agenda

1.   Good and bad points of using different types of electricity

2.  Energy Q&A

3.  What materials can electricity flow through




Here are the notes taken in different groups

Hydoelectricity


Pros                                           Cons
Inexpensive                                not available everywhere
causes little pollution                  kills plant & aquatic life


Electrical energy produced by flowing water is called hydroelectric energy
Turbines inside the dam provide energy for many factories.



Uranium

Uranium is a metallic element most commonly used as a fuel. When atoms of a certain isotope of uranium are hit with neutrons, a reaction called atomic fusion occurs releasing a lot of energy.





Sun 

Pros                                        Cons

renewable                               expensive
Easy to obtain                         does not work when it rains
Causes no pollution                does not give as much electricity
www.solarenergy.net


Used to warm water and give off electricity
India uses it.












Wind Power


Pros                                                Cons

does not cause pollution                Does not work everywhere.
                                                       creates a lot of sound.
                                                       sometimes theres wind and sometimes not          










studentenergy.wordpress.com 





Nuclear


Pros                                                          Cons

Can charge laptops and phones                Creates a lot of pollution
                                                                  Can explode and kill people





Potential-kinetic of turbine to thermal to nuclear.




Geothermal



Pros                                        Cons

Good for the earth                 gets used up
                                               causes pollution

www.ucsusa.org




Worksheet

Sci7.1 - Expert Collaboration - Power Sources


    What is your topic? *


    Write down the members of your group. *


    What block is this? *


    Describe all the energy transformations involved in the power? _____ → electrical kinetic.

    *Don’t forget all of the technologies produce thermal energy.

    Write down the good points about the power generation. *


    Write down the bad points about the power generation. *


    Write down at least six interesting facts about the technology (other than the other three questions). Remember at least three of them. *


    Write down three countries that use this power a lot.

    Optional

    Write down the biggest power plant of this type in the world

    Optional








After we worked on our online quiz, we investigated what materials conducted electricity.



What materials can electrical energy go through? KEY


Safety

  • Do not eat any of the materials.


Background information:

  • Electrical energy flows through some materials easily.  Other materials, it doesn’t flow through.

Variables:
Independent (the one that the experimenter chooses)
  • the material that may close the circuit; will electrical energy flow through
Dependent (changes depending on the independent)
  • the flow of current indicated by the needle on the ammeter
Control a) constants
What do you think are the control variables?

Hypothesis: Do group research using Google Advanced.  Write the hypothesis here.  Cite the sources at the bottom using easybib.com in a works cited list.






The electrical energy will flow through metals.  The energy will not flow through non-metals such as plastics, rubber, wood and other insulators.

Materials & Prediction:
Equipment
  • tray
  • 2 alligator clip wires
  • battery
  • battery holder
  • ammeter

Material
Conducts (flows) (C) or Insulates (doesn’t flow - I)
Write C or I below.  
Optional: explain why.
pen
I (because electricity doesn’t flow through plastics)
pencil
I
motor
C
pyrite
C - looks like a metal
graphite
I
quartz
I
Aluminum bar
C
wire with copper exposed
C
wire completely insulated
I
rubber hose
I
rusty nail
C
paper clip - large
C
spring
C


Procedure/Method:

  1. Connect objects to the alligator clips wire.  
  2. Touch those objects to the terminal of the battery that does not have alligator wire attached.
  3. Record your observations as conducts if the needle moves.  Record your observation as insulates if the needle does not move.  Record the reading on the ammeter.
  4. Repeat steps 1 to 3 for all the objects.

Observations:
a) Raw Data

Material
Conducts (C) or Insulates (I)
Reading on the Ammeter
/ A
Qualitative (describe observations using words and NOT numbers)
pen
I
0
plastic
pencil
I
0
wood
motor
C
0.1
- the motor spun,
- if the motor spinning was held, the reading on the ammeter increased!
- a humming sound
pyrite
C
0.4
the more the alligator clip was pushed on the pyrite, the more the current was
graphite
C
3+, 1.8
the needle moved a lot
quartz
I
0
white rock
aluminum bar
C
3+
the terminals heat up a little
wire with copper exposed
C
3+
the terminals heat up a little
wire completely insulated
I
0
- if the clips are touched to the little bit of wire inside the insulation and the wire is touched to the terminal, it will read a current
rubber hose
I
0
- rubber
rusty nail
C or I
3+
- needle would move
- if the place where the alligator clip is attached, the reading would be different
paper clip
C
> 3
the terminals heat up a little

Conclusion:
The purpose of our conclusion is
    • to summarize the results and
    • to compare the results to the prediction.
  1. Which materials were conductors and which were insulators?  Which results agreed with the prediction?  Which results did not agree with the prediction?
The following materials were conductors and agreed with the predictions: paper clip, rusty nail, wire with copper exposed, aluminum bar, pyrite and the motor

The following materials were insulators and agreed with the predictions: rubber hose, insulated wire, quartz, pencil and pen

The materials that did not agree with the prediction were: the graphite conducted electricity even though it’s not a metal, the rusty nail would not conduct electricity if the wires were connected to the rusty parts


  1. Why did some results - if any - not agree with the prediction?

All metals conduct electricity, but maybe some non-metals can conduct electricity too.

  1. What were the energy changes involved in the
    1. the motor?
electrical → kinetic of the motor,  sound (& thermal)

    1. the paper clip? (challenge - optional)
electrical → thermal

Evaluation (challenge):
The purpose of our evaluation is to
    • to improve the procedure.
    • to suggest the next investigation.

  1. Is there any way the procedure can be improved so that the experiment is easier to follow?
A picture of the experimental set-up can be included to show how the parts of the circuit are connected.


  1. Describe another investigation regarding electrical energy.  
Could change the number of batteries and measure the current.

Optional Challenge: Write down what would be the independent, dependent and control variables.

Variables:
Independent (the one that the experimenter chooses)
  • # batteries
Dependent (changes depending on the independent)
  • current
Control a) constants
  • wiring,


Discussion
  1. Did anything surprise you?
Yes, the graphite conducted electricity.  I predicted it wouldn’t

  1. Did you try any other materials - what were the results?
I tried my hand and no current was measured.


Works Cited

  • "Electrical Conductors." BBC News. BBC, n.d. Web. 23 Aug. 2013. <http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/circuits_conductors/read/2/>






2 comments:

  1. Remember to label your post: Block 3, Scribe, Unit 1- Energy

    ReplyDelete
  2. You should include the answers from the form.

    ReplyDelete

Please write positive comments or constructive feedback in full sentences.