Why Make Electrons Flow Anyway?

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Presentation transcript:

Why Make Electrons Flow Anyway? 4.2.3A Ohm’s Law & Circuit Basics By Mr. Wilson Modified by Mr. Wanninkhof

Ohm’s Law Voltage results in current flow More voltage = more current Resistance opposes current flow More resistance = less current

Example #1 A potential difference of 25.0 volts is supplied to a circuit with 100 ohms of resistance. How much current flows through this circuit? I = ? V = 25 V R = 100 Ω electricity I R = V/I I IR /R = V /R I = V/R I = (25 V) /100 Ω I = 0.25 A

Example #2 A current of 2.0 amperes flows through a 10 ohm resistance. What voltage must be applied to this resistance? V = ? I = 2 A R = 10 Ω electricity I R = V/I I IR = V V = (2A)(10 Ω) V = 20 V

Example #3 A 10 volt battery establishes a current of 5.0 amperes in a circuit. What is the resistance of this circuit? V = 10 V I = 5 A R = ? electricity R = V/I R = (10 V)/(5 A) R = 2 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 cell battery

Circuit Elements – Resistances fixed resistor variable resistor lamp

Circuit Elements – Switch

Circuit Elements – Measuring Devices Measures: VOLTAGE Resistance: HIGH Connect to circuit: OUTSIDE Measures CURRENT Resistance: LOW Connect to circuit: INSIDE voltmeter ammeter

Proper Use of Meters 5 V 2.5 Ω 0 V 2 A 2 A 0 V 5 V 5 V NEXT

End of 4.2.3A