Ohm’s law
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  • 1. Ohm’s LawOhm’s LawThis presentation is designed to giveyou the basic principles of Ohm’sLaw
  • 2. Learning Objectives- UponLearning Objectives- Uponcompletion of this lesson…completion of this lesson…Students will know the various variables ofOhm’s Law and what they signifyStudents will know the relationships of thevariableStudents will know how to compute themissing variable given the other two
  • 3. V= VoltageV= VoltageVoltage is the amount of work done per unitof chargeVoltage is measured in Joules per CoulombIt is often thought of as the amount of“energy” being appliedThe unit applied is “Volts/V”
  • 4. I= CurrentI= CurrentCurrent is the flow of electrical chargethrough a systemCurrent is measure in amperes, which isequivalent to 1 coulomb per secondThe unit applied is “Amperes/Amps”
  • 5. R=ResistanceR=ResistanceResistance is the opposition to the pass ofthe electrical current.Resistance is caused by objects such aslights or switches being applied to a circuitResistance is measured in ohmsThe unit applied is “Ohms/Ω”
  • 6. Ohm’s LawOhm’s Law
  • 7. Ohm’s LawOhm’s Law
  • 8. Solving for “V”Solving for “V”• Cover “V”• Remaining formula is “I x R”• Meaning as current or resistance increasesthe voltage will increase• Giving voltage a direct relationship to theother two variables
  • 9. Ohm’s LawOhm’s Law
  • 10. Solving for “I”Solving for “I”• Cover “I”• Remaining formula is “V/R”• Meaning as voltage or resistance increasesthe current will decrease• Giving current an inverse relationship to theother two variables
  • 11. Ohm’s LawOhm’s Law
  • 12. Solving for “R”Solving for “R”• Cover “R”• Remaining formula is “V/I”• Meaning as current or voltage increases theresistance will decrease• Giving resistance an inverse relationship tothe other two variables
  • 13. Practice ProblemPractice Problem
  • 14. Ohm’s LawOhm’s Law
  • 15. SolutionSolution
  • 16. Ohm’s Law Basics RecapOhm’s Law Basics RecapVoltage is directly related to current andresistanceCurrent and resistance are inverselyrelated to the other variablesUse the pie chart to solve for missingvariables in a circuit
  • 17. Practice:Practice:With a partner fill in the missing values from the table.With a partner fill in the missing values from the table.20 V 0.2 Amps ? Ω120 V 5 Amps ? Ω240 V ? Amps 4 Ω? V 0.4 Amps 8 Ω9 V ? Amps 0.3 Ω