Ohm’s law
Transcript of Ohm’s law
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Ohm’s LawOhm’s Law
This presentation is designed to give you the basic principles of Ohm’s
Law
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Learning Objectives- Upon Learning Objectives- Upon completion of this lesson…completion of this lesson…
Students will know the various variables of Ohm’s Law and what they signify
Students will know the relationships of the variable
Students will know how to compute the missing variable given the other two
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V= VoltageV= Voltage
Voltage is the amount of work done per unit of charge
Voltage is measured in Joules per CoulombIt is often thought of as the amount of
“energy” being appliedThe unit applied is “Volts/V”
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I= CurrentI= Current
Current is the flow of electrical charge through a system
Current is measure in amperes, which is equivalent to 1 coulomb per second
The unit applied is “Amperes/Amps”
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R=ResistanceR=Resistance
Resistance is the opposition to the pass of the electrical current.
Resistance is caused by objects such as lights or switches being applied to a circuit
Resistance is measured in ohmsThe unit applied is “Ohms/Ω”
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Ohm’s LawOhm’s Law
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Ohm’s LawOhm’s Law
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Solving for “V”Solving for “V”
• Cover “V”• Remaining formula is “I x R”• Meaning as current or resistance increases
the voltage will increase• Giving voltage a direct relationship to the
other two variables
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Ohm’s LawOhm’s Law
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Solving for “I”Solving for “I”
• Cover “I”• Remaining formula is “V/R”• Meaning as voltage or resistance increases
the current will decrease• Giving current an inverse relationship to the
other two variables
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Ohm’s LawOhm’s Law
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Solving for “R”Solving for “R”
• Cover “R”• Remaining formula is “V/I”• Meaning as current or voltage increases the
resistance will decrease• Giving resistance an inverse relationship to
the other two variables
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Practice ProblemPractice Problem
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Ohm’s LawOhm’s Law
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SolutionSolution
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Ohm’s Law Basics RecapOhm’s Law Basics Recap
Voltage is directly related to current and resistance
Current and resistance are inversely related to the other variables
Use the pie chart to solve for missing variables in a circuit
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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 ? Ω
120 V 5 Amps ? Ω
240 V ? Amps 4 Ω
? V 0.4 Amps 8 Ω
9 V ? Amps 0.3 Ω