Download 7 minutes ASSESSMENT Name

CVMEA Modeled Students’ Booklet
CIRCUITS
The Eagle Academy
Teacher: Rashidul Bari
7/24/2015
Student Name: ………………………………………………………………………..
You guys will receive the instructions for how to use this booklet in the beginning of the class.
Pay attention, and take notes & you’ll do fine.
NOTE: I will apply my quad-modeling scheme (Which I developed at NYU): conceptual, Visual,
mathematical, and algorithmic to help student mastering the concept:
electric charge
CONCEPTUAL
1.
What is an electric charge?
a. The physical property of matter that causes it to experience a force.
b. The Chemical property of matter that causes it to experience a force.
c. The physical property of matter that causes it to experience a gravity
Visual
Lets say there are four charges (q1, q2, q3, q4) on my
table here. Charge q1 attracts q2 but q2 repels q3, and
q3 repels q4 and q4 is positively charge. What is the
sign of charge q1?
Mathematical
Two small charges are 3 meters apart and
each has a charge 100 coulomb. Calculate the
magnitude of the force exerted by one charge
on the other.
Electric Force
CONCEPTUAL
What is Electric Force (EF)?
a. EF acting on a gravity as a result of the presence of electricity
b. EF acting on a charge (q1) as a result of the presence of q2
c. EF is acting on a water
Visual
Mathematical
When a charge of .040 coulomb is placed at a
point in electric field, the force on the charge is
100 Newton. What is the magnitude of the
electric field?
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Electric Field
CONCEPTUAL
What is Electric Field (EF)?
a. A region around a charged particle within which a force would be exerted on other charged
particles. (F =qE)
b. A region around an atom
c. A region around an atom
Visual
Mathematical
When a charge or 0.040 coulomb Is placed a point in the electric
field, the force on the charge id 100 Newton. What is the
magnitude of the electric field at that point?
Voltage
3. What is Voltage?
a. A voltage represent as source of energy
a. A voltage represent as source of gravity
a. A voltage represent as source of force
Visual
Mathematical
The work required to move a charge of 0.04 Coulomb from
one point to another in an electric field is 200 joules.
Current
4.
a.
b.
c.
What is Current?
Gravity is a flow of electric charge
Force is a flow of electric charge
Current is a flow of electric charge
Visual
Mathematical
Calculate the current in a conductor if 130
Coulumbs of charge is transferred in 20 seconds.
electric circuit
5. What is electric circuit?
a. A path in which proton from a voltage source flow.
b. A path in which electrons from a voltage source flow.
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c. A path in which electrons from a voltage source flow.
Visual
Mathematical
A resistor has a resistance of 10 ohms and current in it
of .50 ampere. What is the potential difference across the
resistor?
series circuit
6.
d.
e.
f.
What is series circuit?
Current is equal everywhere.
Voltage is equal everywhere.
Resistance is equal everywhere.
Visual
Mathematical
In a series circuit containing three resistors having
resistances of 5,10, and 15 ohms, respectively, we know
that the current in the 15 ohm resistor is .5 ampere. This
tells us that the current is also .5 ampere in the 5 ohm
and 10 ohm resistors as well as in the generator
connected to the circuit.
Experiment
Mini lesson (Part 2)
You guys will work in a group to complete these lemon batteries activities:
Materials:
1.
2.
3.
4.
5.
6.
Copper wire
Penny and Nail
Voltmeter
1.5 volt LED bulb
Lemons
Plastic knife
Student Activity
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Student will follow following 10 steps to make a lemon battery (Follow the steps very carefully):
a. Shake and roll the lemon on a table to "activate" the electrolyte in the lemon.
b. Use the plastic knife to cut two small slices in the lemon about 1/2 inch apart (see the
pictures at the end of this booklet).
c. Rub the zinc (Nail) and copper (Penny) firmly with the steel wool.
d. Insert the Nail and Penny into the slits on the lemon, being careful that the strips not
touch each other.
e. Now measure the voltage using Voltmeter. How much voltage does each lemon
produce? (Hint: each lemon produces about .50 voltages. )
f.
Do the math. (Hint: how many lemons do you need to use to illuminate a 1.5 voltage
LED bulb?)
g. Now use a copper wire instead of penny (wrap copper wire around your finger)
h. Make a circuit using Alligator clip
i.
Connect LED bulb
Results Table(Collect the data):
Number of Lemons
Voltage Measured
Led Lit (Yes or No)?
Graph it using the data from above table:
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READ THE FOLLOWING INFORMATION CAREFULLY TO ANSWER THE QUESTION
BELOW:
All batteries have a "POSITIVE" and "NEGATIVE" terminal (See figure below). We call them
ELECTRODES. One of the electrodes (NAIL) will tend to lose electrons and the other electrode
(Copper) will tend to gain electrons. The NAIL that loses electrons is called the anode. The COPPER
that gains electrons call cathode.
The copper wires act as conductors, allowing electrons to flow through them. Electric current is a flow
or pushing of electrons through a circuit from cathode, through a conductor, towards the anode. Volts
(voltage) is a measure of the force moving the electrons. The zinc (Nail) gives up electrons more easily
than the copper (Penny). Why?
Because the zinc is significantly more reactive with an ELECTOLYTE (ACID of LEMON) than the
copper. This creates a large potential energy difference (voltage) between the two electrodes.
1. Lemon battery is similar to the first electrical battery invented in 1800 by Volta
2. The Zinc (Nail) and Copper (Penny) are called electrodes and the juice inside the lemon is
called the electrolyte.
3. Electric circuit allows chemical reaction because the zinc (nail) inside the lemon dissolves into
the solution.
4. This Chemical reaction (between electrode and electrolyte) is called reduction.
5. A Current created as ELECTRON are pushed from one (nail) electrode to other (COPPER).
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6. The Nail loses negatively electrons when it is dissolved in an acid. Thus, the zinc electrode
becomes more positively charged.
7. The copper (penny) gains negatively charged electrons that are pushed through the wire from
the zinc. The copper electrode becomes more negatively charged. The negatively charged
electrons begin to repel one another, which stops the flow of the electrons.
The zinc (Nail) gives up electrons more easily than the copper (Penny). The zinc is significantly more
reactive with an acid than the copper. This creates a large potential energy difference (voltage) between
the two electrodes.
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7 minutes
ASSESSMENT
Name:
1. In a series circuit containing three resistors having resistances of 5,10, and 15 ohms, respectively, we know that the
current in the 15 ohm resistor is .5 ampere. This tells us that the current is also .5 ampere in the 5 ohm and 10 ohm
resistors as well as in the generator connected to the circuit.
2. Explain the chemical reaction (What should be on the left & right box and what is transferring from
left to right box?
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A Picture Guide to Make Electrical Battery using Lemon (For students with disabilities)
1. Nail (Zinc) & Penny (Copper)
2. LED Bulb
3. Electrolyte (Lemon)
4. Cathode (Nail) & Anode (Penny)
5. Circuit
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6. LED Lights-up!
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