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Statics, Coulomb Law, and current electricity.Friday, February 12, 2016
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Friday, 2/12
How are the forces of gravity and the forces that keep the planets rotating around the sun similar? How are they different?
Upcoming dates: Friday, 2/12 – Statics quiz – moved to Wednesday, 2/17 Wednesday, 2/17 – Series circuit quiz – moved to Friday, 2/19 Friday, 2/19 – Parallel circuit quiz – moved to Tuesday, 2/23 Tuesday, 2/23 – Circuit design due Thursday, 2/25 – Unit quiz Monday, 2/29 – Electricity Test and missing work deadline Friday, 3/4 – Magnetism quiz Friday, 3/4 – 3NWS Extra credit due by 4:00 PM Thursday, 3/10 – Waves Quiz Friday, 3/11 – End of the 3NWS
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Thursday, 2/11
Use your video notes to complete the following sentences about static electricity:1. Static electricity is also know as electricity at
rest2. Static electricity produces electric charges that
can be confined to an object.
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Induction/Conduction guiding questions (6 minutes) What circumstances must be present for
conduction to take place? What type of charge is transferred during the
process of conduction? Draw the diagram that demonstrates conduction. What circumstances must be present for
induction to take place? What type of charge is transferred during the
process of induction? Draw the diagram that demonstrates induction.
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Coulomb’s Law guiding questions (6 minutes Explain the affect the value of the charges and
and the distance of the charges has on the electrical force.
Write Coulomb’s equation and label the variables (include units).
How do you convert micro coulomb’s (μC) to coulombs
What does the value of Felectric tell you about the charges attraction/repulsion?
Set up the G and U for example #1.
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Practice
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Article – Shocking idea Number your paragraphs (there should be 8). Highlight the following words:
Electricity (all versions such as electric) Shock Charge Static Positive Negative Neutral Friction
Circle words you don’t know the meaning of. Underline statements about static electricity.
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Electric Current The continuous flow of electrons
through a conducting metal.
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Alternating Current Flow of current that periodically changes
direction Produced in power plants
Current from a wall outlet changes direction 120 times per second
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Direct Current The flow of current in one consistent
direction Examples
Batteries Solar cells
Current from a battery travels from the positive terminal to the negative terminal.
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Common Language
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Note Taking GuideQuantity Symbol Definition Unit Measuring Device
voltagecurrent
resistance
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Voltage Voltage (V) (also know as Potential Difference)
can be thought of as the force pushing electric charges along a conductor. Voltage between two points creates an electric field. Measured in Volts (V)
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Voltmetera device that measures
electric potential difference, must be connected in parallel
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Current Electric current (I) is the movement of
electric charge in a conductor. Measured in Amps (A)
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Ammetera device that measures current
attached in series
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Resistance Resistance (R) is a measure of how
difficult it is to push the charges along. The energy is transformed at the
resistor (potential energy is converted). Examples: light bulb, charging your
phone, making coffee, etc. Measured in Ohms ()
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Note Taking GuideQuantity Symbol Definition Unit Measuring Device
voltage V Energy in the circuit
Volts Voltmeter
current I Rate of flow Amps Ammeterresistance R Opposes current OhmsΩ Ohmmeter
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Ohm’s Law Ohm's Law analyzes the relationship
between voltage and current in an ideal conductor.
Ohm's Law is given by:
V = I * R
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ExampleA flashlight that is powered by 3 volts and uses a bulb with a resistance of 60 ohms. What is the current flowing through the circuit?
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Practice
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Electrical Circuit Terminology Circuit – a path that allows electricity to
flow Circuit diagram – a simplified
representation of an electrical circuit that shows only the electrical connections of elements in a circuit.
We will study two types of circuits: Series circuit Parallel circuit
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Cool Down What is the difference between static
and current electricity?
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Resistors can be connected in series; that is, the current flows through them one after another.
Series Circuits
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Kirchhoff’s RulesLoop Rule: The sum of the potential differences (voltage) around any closed circuit loop is zero.
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Kirchhoff’s RulesLoop Rule: The sum of the potential differences (voltage) around any closed circuit loop is zero.
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Series Circuit1. total resistance is the sum of the separate resistors
RT = R1 + R2 + R3 + ...2. current is the same through each resistor
IT = I1 = I2 = I3 = ...3. total potential difference is the sum of each
VT = V1 + V2 + V3 + ...In other words, in a series circuit,
resistance and voltage add,but current stays the same.
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Series Circuit Example