This presentation provides an overview of Ohm's Law, which describes the relationship between voltage, current, and resistance in electrical circuits. It defines each variable, explains their units of measurement, and how they relate to one another. The objectives are for students to understand the variables, their relationships, and how to use the formula to compute a missing value. Examples are provided to demonstrate solving for voltage, current, and resistance.

1. Ohm’s LawOhm’s Law
This presentation is designed to give
you the basic principles of Ohm’s
Law

2. Learning Objectives- UponLearning 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

3. V= VoltageV= Voltage
Voltage is the amount of work done per unit
of 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 charge
through a system
Current is measure in amperes, which is
equivalent to 1 coulomb per second
The unit applied is “Amperes/Amps”

5. 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 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 increases
the voltage will increase
• Giving voltage a direct relationship to the
other 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 increases
the current will decrease
• Giving current an inverse relationship to the
other 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 the
resistance will decrease
• Giving resistance an inverse relationship to
the other two variables

13. Practice ProblemPractice Problem

14. Ohm’s LawOhm’s Law

15. SolutionSolution

16. 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

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 ? Ω
120 V 5 Amps ? Ω
240 V ? Amps 4 Ω
? V 0.4 Amps 8 Ω
9 V ? Amps 0.3 Ω