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# Ohm’s law

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### Ohm’s law

1. 1. Ohm’s LawOhm’s LawThis presentation is designed to giveyou the basic principles of Ohm’sLaw
2. 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. 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. 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. 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. 6. Ohm’s LawOhm’s Law
7. 7. Ohm’s LawOhm’s Law
8. 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. 9. Ohm’s LawOhm’s Law
10. 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. 11. Ohm’s LawOhm’s Law
12. 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. 13. Practice ProblemPractice Problem
14. 14. Ohm’s LawOhm’s Law
15. 15. SolutionSolution
16. 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. 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