Ohm's Law
Presentation
•
Science
•
6th - 8th Grade
•
Medium
Standards-aligned
Barbara White
Used 28+ times
FREE Resource
8 Slides • 8 Questions
1
Ohm's Law
Middle School
2
Learning Objectives
3
Key Vocabulary
Voltage (V)
The difference in electric potential between two points, which causes electrons to flow.
Current (I)
The rate of flow of electric charge or electrons through a conductor material.
Resistance (R)
The opposition to the flow of electric current, converting electrical energy into heat.
Ohm's Law
A law stating that current is directly proportional to voltage and inversely proportional to resistance.
4
Measurements in Electricity
Voltage (V)
It is the difference in electric potential energy per unit charge between two points in a circuit.
This force causes electrons to flow from high to low voltage.
The unit of measurement for voltage is the Volt (V).
Current (I)
Current is the rate of flow of electrons through a material.
It measures how fast or how much electricity is actually flowing.
The unit for measuring the current is the Ampere (A).
Resistance (R)
Resistance opposes the flow of electrons through a given material.
It acts like friction and converts electrical energy into heat.
Resistance is measured in a special unit called Ohms (Ω).
5
Multiple Choice
Which of the following is the measure of a material's opposition to the flow of electrons?
Voltage (V)
Current (I)
Resistance (R)
Potential Difference
6
Ohm's Law
7
Multiple Choice
According to Ohm's Law, if the resistance in a circuit increases and the voltage remains the same, what happens to the current?
It increases.
It decreases.
It stays the same.
It becomes zero.
8
Calculating with Ohm's Law
9
Multiple Choice
Using the formula , what is the current in a circuit with a 24-volt battery and 6 ohms of resistance?
4 A
144 A
0.25 A
18 A
10
Common Misconceptions
Misconception | Correction |
|---|---|
Voltage and current are the same thing. | Voltage is the push on electrons; current is the flow of electrons. |
Resistance is always bad. | Resistance is essential to control current and is used in many appliances. |
Any amount of voltage is dangerous. | The danger of electric shock depends on the current, not only the voltage. |
11
Multiple Choice
In a simple circuit, if you keep the voltage the same but use a wire with higher resistance, what will be the effect on the current?
The current will increase because it has to work harder.
The current will decrease because the flow of electrons is opposed more strongly.
The current will stay the same because the voltage has not changed.
The current will alternate directions.
12
Multiple Choice
Why is a material like copper, which is a good conductor, described as having low resistance?
Because it has a high potential difference.
Because it does not allow electrons to flow easily.
Because it presents very little opposition to the flow of electrons.
Because it converts a lot of electrical energy into heat.
13
Multiple Choice
A student wants to power a small motor that requires a current of 2 A to operate correctly. If the motor has a resistance of 6 Ω, what voltage battery should the student use?
3 V
8 V
12 V
0.33 V
14
Multiple Choice
A circuit contains a 20 V battery and a 10 Ω resistor. If you replace the 10 Ω resistor with a 5 Ω resistor, what will happen to the current?
The current will be cut in half because the resistance is lower.
The current will double because the resistance is lower.
The current will stay the same because the battery voltage is constant.
The current will increase to 25 A.
15
Summary
16
Poll
On a scale of 1-4, how confident are you with applying Ohm's Law to solve problems?
1
2
3
4
Ohm's Law
Middle School
Show answer
Auto Play
Slide 1 / 16
SLIDE
Similar Resources on Wayground
14 questions
The Universe Unit Launch
Presentation
•
6th - 8th Grade
14 questions
Galaxies
Presentation
•
6th - 8th Grade
14 questions
The Scientific Method
Presentation
•
6th - 8th Grade
12 questions
Genes, Chromosomes, and DNA
Presentation
•
7th - 8th Grade
15 questions
Rotation and Revolution
Presentation
•
6th - 8th Grade
10 questions
Urbanization
Presentation
•
6th - 8th Grade
10 questions
Variables
Presentation
•
6th - 8th Grade
10 questions
Bacteria- Lesson
Presentation
•
6th - 8th Grade
Popular Resources on Wayground
24 questions
PBIS-HGMS Day 10
Quiz
•
6th - 8th Grade
10 questions
HCS SCI 03 Summer School Review 3
Quiz
•
3rd Grade
11 questions
Home Scope
Quiz
•
7th - 8th Grade
15 questions
HCS SCI 05 Summer School Assessment 3 Review
Quiz
•
5th Grade
35 questions
Lufkin Road Middle School Student Handbook & Policies Assessment
Quiz
•
7th Grade
18 questions
Geo 11.3 Area of Circles and Sectors
Quiz
•
9th - 11th Grade