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Published byPierce Fields
Modified over 4 years ago
4.2.3A Ohm’s Law & Circuit Basics Why Make Electrons Flow Anyway?
Ohm’s Law Voltage results in current flow More voltage = more current Resistance opposes current flow More resistance = less current
A potential difference of 25.0 volts is supplied to a circuit with 100 ohms of resistance. –How much current flows through this circuit? Example #1 I = V / R I = 25.0 V / 100 Ω I = 0.25 A
A current of 2.0 amperes flows through a 10 ohm resistance. –What voltage must be applied to this resistance? Example #2 I = V / R V = IR V = (2.0 A)(10 Ω) V = 20 V
A 10 volt battery establishes a current of 5.0 amperes in a circuit. –What is the resistance of this circuit? Example #3 I = V / R R = V / I R = (10 A) / (5.0 A) R = 2.0 Ω
What is a circuit? A continuous loop through which current flows from an area of high voltage to a an area of low voltage.
Circuit Elements – Voltage Sources batterycell
Circuit Elements – Resistances variable resistorfixed resistor lamp
Circuit Elements – Switch switch
Circuit Elements – Measuring Devices Measures: VOLTAGE Resistance: HIGH Connect to circuit: OUTSIDE voltmeter Measures CURRENT Resistance: LOW Connect to circuit: INSIDE ammeter
Proper Use of Meters 5 V 2.5 Ω 0 V 2 A 5 V 0 V 2 A 5 V NEXT
End of 4.2.3A
Kewell kow Copy down the following chart: QuantitySymbolEquationsStandard Metric Unit Other Units Potential Difference (aka Voltage) VV = W / q V = IR.
II. Electric current 1. Definition Units: [ I ] = 1A = 1 C/s Conventional current Electron flow Example: electrons passed through the electric conductor.
Current and Resistance
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley Electricity Physics 102 Goderya Chapter(s): 22 and 23 Learning Outcomes:
Current, Voltage, and Resistance in a circuit
Resistance in Electrical Systems
Series and Parallel Circuits
Electricity and Electrical Circuits. Chapter Sections O 1 - Electrical Circuits O 2 - Current and Voltage O 3 - Resistance and Ohm’s Law.
Circuits & Electronics
2/25 Do now Sphere A has a positive charge of 9 C. Sphere B and sphere C are neutral. Sphere A is used to charge sphere B by conduction. Sphere A is used.
ELECTRIC CIRCUITS. Electric Circuits What is an electric circuit? SO EASY! A circuit is a loop of wire with its ends connected to an energy source such.
4.3 Notes Resistance in Electrical Systems. Properties of Materials Conductors Have a large ability to conduct electric current They contain many free.
The “Live Action” Physics Review Game Topic: Circuits.
Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
Circuits and Ohm’s Law Objectives: 1. Gain an understanding of Ohm’s Law. 2. Compare and contrast the movement of current through a series and parallel.
Electrical circuits. Intensity (I): Number of charges that flow past a given point every second. Measured in Amperes (A). Wires that carry the electrical.
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