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”
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
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
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
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