Current & Ohms Law 03 2000

Basic Electricity ,[object Object],E-mail [email_address] Consulting

Meaning of Current!! ,[object Object],[object Object],[object Object],[object Object]

Interesting Electrons !! ,[object Object],[object Object],[object Object]

Electron Drift !! ,[object Object],[object Object],[object Object]

Meaning of Ampere !! ,[object Object],[object Object],E.g. The current through the resistor is 5 amperes . Or The current through the resistor is 5 coulombs per second. Or I R = 5 A - - - > (Simple)

Meaning of Coulomb !! ,[object Object],[object Object],[object Object]

Current shown Graphically!! Conductor Given Point 0 1 second Second Timer 1 Coulomb Rate of Electron flow ( CURRENT ) is 1 coulomb per second ( 1 AMPERE ) I = 1C/s = 1 ampere 1 Coulomb moved . . 6.24 x 10 18 electrons

Speed up Electron Flow Graphically!! Conductor Given Point Second Timer 1 Coulomb Rate of Electron flow ( CURRENT ) is 1 coulomb per 1/2 second ( 2 AMPERES ) I = 1C/.5s = 2 amperes 1 Coulomb moved . . 0 .5 second 6.24 x 10 18 electrons

24V DC 24V DC For current to be present in a circuit . . . AC Ammeter Voltage Source and a Complete Path + -

Current Measurement !! ,[object Object],[object Object],[object Object],AC Ammeter No Polarity Shown

Ohm’s Law then & now! ,[object Object],[object Object],[object Object],[object Object],[object Object]

Clamp-On Ammeter ,[object Object],[object Object],[object Object],[object Object],[object Object],10A

Current Facts! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1A 10V Ohm’s Law states that . . The current is directly proportional to the voltage and indirectly proportional to the resistance . 10  20  10  2A 20V 1A .25A .5A 1A 5V 10V Voltage UP Current UP Resistance UP Current DOWN Voltage DOWN Current DOWN Resistance DOWN Current UP Voltage UP Current UP + -

Ohm’s Law ,[object Object],[object Object],[object Object]

Original Ohm’s Law ,[object Object],[object Object],[object Object],[object Object],[object Object]

Using Ohm’s Law ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ohm’s Law in Action (I)! 2A 10  20V A. I = E / R = 20 / 10 = 2A Q. What is the current through the resistor? + -

Ohm’s Law in Action (V) ! 2.8A 5  14V Ans. E = IR = 2.8 x 5 = 14V Q. What is the voltage across the resistor? + -

Ohm’s Law in Action (  ) ! .1A 240  24V Ans. R = E/I = 24 ÷ .1 = 240  Q. What is the resistance of the resistor? + -

Hydraulic Analogy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Summary . . .

The End ivan.tandberg@shaw.ca Ph 1-403-361-0703 Silver Sage I = E R

Current & Ohms Law 03 2000

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Current & Ohms Law 03 2000