Transcript Bell Work 3-22-10

Does your body use electricity at
all? Is it similar to a circuit?
-Explain your answer
Yes, electrical signals travel along nerves
carrying information to and from your BRAIN.
Heart uses electrical impulses to move blood
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__Electric field
__Electric force
__Electric current
__Electric circuit
a. How electric charges are
drawn towards or pushed
away
b. The continuous flow of
electric charges through
material
c. A complete unbroken path
through which electric
charges can flow
d. Region around a charged
object (proton, electron)
where electric force is
exerted
• OPEN YOUR BOOK to page 36. Neatly,
recreate diagram A, B, and C (write the verbal
explanation and pay attention to vector
arrows)
http://phet.colorado.edu/en/simulation/electric-hockey
• Why can we not use lightning as a source of
current electricity?
•
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• We can not control the flow of electrons. All
the energy is released immediately.
• What three components do you need to have a
complete circuit? Give three examples of each
1. Power Source (push/force volts) battery,
generator, solar cell
2. Conductor (transfers electrons)-wires, nerves,
metals
3. Resistor/Load (uses the electricity)- refrigerator,
fan, lights, dryer, etc.
• Why do conductors allow ELECTRONS to move
throughout more easily than insulators?
a. The atoms that make them up have tightly
bound electrons.
b. The atoms that make them up have more
electrons
c. The atoms that make them up have loosely
bound electrons
d. The atoms that make them up have less
electrons
• The third prong of an appliance is connected to ?
a.
b.
c.
d.
The line coming from the electric plant
The ground wire
The line going to the electric plant
A circuit breaker or fuse
- Appliances need to be grounded so that charges are
able to flow directly from the circuit into Earth in the
event of a short circuit or power surge
• Using your notes for Ohm’s Law. What
happens to the current if you???????
•
•
•
•
Increase Voltage
Increase Resistance
Decrease Voltage
Decrease Resistance
Current will _______
6 Craziest Extinctions
https://www.youtube.com/watch?v=wissIOikrqc
• In a series circuit, the more light bulbs that are
added, the bulbs become?
a. Dimmer
b. Hotter
c. Brighter
d. More Resistant
For a given voltage being pushed, more RESISTORS
decrease the flow of the electric current
• What TWO factors will determine your
households energy bill each month?
A.
B.
C.
D.
Power and Volts used
Power and Amps used
Power and Time
Power and Resistance
-So turn off the lights, shut the fridge, shut the
door, unplug appliances not being used, You’ll
pay one day
• If your household’s electric meter was at 2,982
kWh on February 12 and 3,292 kWh on March
12. How much was the energy bill for that
month?
Assume energy cost is about $.85 cents per
kWh.
$263.50 for that month
• A microwave has a power rating of 1000 W
and uses the standard voltage in your
household (120 V). What is the current
through the microwave?
Current ___________________
• What do power companies
use to transfer electricity
over long distances via
power lines?
a.
b.
c.
d.
Converters
Capacitors
Transcoders
Transformers
http://www.youtube.com/watch?v=tUO3o5JTGhQ
• Looking at your diagram of step-up/step-down
transformers
• When the voltage is decreased by a step-down
transformer, is energy (POWER) destroyed in
the process?
• No, even though the voltage decreases, the
current will increase
• POWER = VOLTAGE X CURRENT
• Make a list of technology or items that use an
electromagnet to operate.
• Does your cell phone have a strong enough
electromagnet (magnetic field) to scramble a hotel key
card? Explain……
• MOST likely, it is either a weak magnetized code caused
by the repeated use of being programmed, OR faulty
reader scanning code to begin with.
• Although highly unlikely it is still possibly plausible
•
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1. Get out you Electromagnet Lab Investigation
2. Look at your data
3. In your composition book discuss the following
prompts
– What factors either strengthened or weakened your
electromagnet?
– Of the items tested what did they have in
common….why magnetic attraction?
– What do you know now that you didn’t get before
investigating?
• Note Book Check?
1. What is the question to the bell work on Feb. 11,
2013
2. Write the ANSWER to the bell work on 1/7/13
3. For the “Star Cycle” what stage was the star in
for No. 3
4. Write out learning target J
5. Write out learning target R
• The brake light on an automobile is connected to
a 12-volt battery. If the resulting current is 0.40
amps, what is the resistance of the
brake?.........remember OHM’s LAW……………
• SHOW YOUR WORK
•
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• List types of technology, in the medical field,
used to examine the anatomy of a patient?
• Do you know what type of energy it uses?
• Explain how the following demonstration
would represent a power plant and electricity
being generated
• To produce an electric current, charges must
flow continuously from one place to another.
Which of the following provides an unbroken
path for charges to flow?
a. A series circuit
b. A parallel circuit
c. A complex circuit
d. All of the above
• YOUR QUIZ
1. Write every learning target since the
beginning of the year
2. Explain how or why you understand the
learning target (USE COMPLETE SENTENCES)
3. Diagram each circuit and explain the flow of
electrons (series, complex, parallel)
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