unit 5 : electricity and...
TRANSCRIPT
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Unit 5 : Electricity and MagnetismToday's Plan
1. Return Waves and Sound Test
2. Go over year end calendar
3. Intro to Electricity and Magnetism
Mon Jan 7th,2019
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Electrical Conductivity
Electric Charge One electron has a charge of ______________________
A conductor is a _____________________________________________
An insulator is a ______________________________________________
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Electric CircuitsAn Electric Circuit is composed of three items
1.
2.
3.
Basic Electrical Circuit Components
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1. Electric Current (ch. 12.3)Electric Current is the ____________ of ____________________
• can be measured as ________________ of electrons that pass a certain
_______________ in a given amount of _______________.
Key Concepts:
Conventional Current –
Electron Flow
Measuring Electric Current
Symbol ________, units __________
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2. Potential Difference (ch. 12.4)Electric Potential Difference (_________) is the amount of ____________
required per unit ____________ to move a positive charge from one point to
another in the presence of an electric field.
Symbol ________, units ____________
Measuring Voltage
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3. Resistance and Ohm's Law (ch. 12.6)Electrical resistance is a measure of how much an electric component
______________ the ___________ of electric charges.
Symbol ________, units ________
Conductors have a very __________________. Insulators have a very
_____________________.
Investigation (using Edison)
Ohm's Law
Non Ohm's Law Devices
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Simple Series Circuit AnalysisCalculate the current through the series circuit with a 4.5V battery and a 180Ω load.
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Electrical PowerRecall power = energy consumed or generated per unit time.
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Practice
Draw the above circuit in your notes.
1. Show the direction of the current.
2. If the lamp is rated for 1 Watt, will it burn out?
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Unit 5 : Electricity and Magnetism day 3Today's Plan
1. review ‐ basic electric circuits & power2. Kirchoff's Current and Voltage Laws
‐ parallel vs series analysis3. Intro to magnetism (time permitting)
Next Day
Jan 10th ‐ Edison Circuit Analysis Assignment
Jan 9th, 2019
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Kirchhoff's Voltage LawThe algebraic sum of all voltages in a loop must be zero.
1. Series circuit analysis
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Kirchhoff's Voltage Law (cont'd)
2. Parallel circuit analysis
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Kirchhoff's Current LawThe total current entering a node must equal the current leaving a node.
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Simple Series Circuit Analysis
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Simple Parallel Circuit Analysis
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Show the direction of current in the above circuit. Characterize the circuit
find voltage and current for each resistor. find total current and total (equivalent) resistance for the circuit
Calculate the overall power used in the circuit.
R1100 Ω
R2100 Ω
R3100 Ω
R4100 Ω
V=200V
Series and Parallel Circuit Analysis