Electricity: Ohm's Law
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Subject Area: Science | Grade Level: 8
Lesson Length: 1 hour
Keywords/Tags: Electricity, Current, Circuits
Lesson Description: Standard: SPS10.a. Use mathematical and computational thinking to support a claim regarding relationships among voltage, current, and resistance. Learning Intention: In this lesson students will explore how electrical current travels through a circuits. Students will be explore the relationships between voltage, current, and resistance. Success Criteria: Students will be successful when they are able to calculate the different components in an electrical circuit. Students also need to be understand the relationship between voltage, current, and resistance.

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Video : Ohm's Law Breakdown
Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.
Description: In this video Ohm's Law is broken down. The relationship between current, resistance, and voltage is discussed in detailed.
Reading : Ohm's Law
Instructions: Please read the following article as many times as needed (aloud and silent) before starting to go through the rest of the lesson pages. Understanding the content of this passage is very important since the following lesson activities will be all about this content. Feel free to print the article if needed.

Ohm's Law

  • This is the relationship between Current, Voltage, and Resistance
  • Volatage = Current x Resistance (V=IR)

Current

  • Current describes how the electrical current flows through the circuit.
  • Current (I) is measured in Amperes or Amps

Voltage

  • Voltage is the difference in electrical potential energy between two places in the electric field. This is also called Potential Difference.

  • This is the power source of the circuit

    • Battery
    • Generator
    • Solar Cell
  • Voltage (V) is measure in Volts

Resistance

  • Resistance is the opposition to the flow of charges in a material. (What resist the charges from flowing)

  • There are three main things that effect the resistance of a material.
    • Length of the material (wire)
      • The longer the wire the higher the resistance
      • The shorter the wire the lower the resistance
    • Thickness of the material (wire)
      • The thicker the wire the lower the resistance
      • The thinner the wire the high the resistance
    • Temperature of the material (wire)
      • The higher the temperature the higher the resistance
      • The lower the temperature the lower the resistance
  • Resistance (R) is measured in Ohms

Resources : Circuit Construction Kit Virtual Lab
Instructions: Please see additional external resources below. Feel free visit each link to learn more about this l
Circuit Construction Kit Virtual Lab
Follow the link to get a hands on experience with current, voltage, and resistance. Create your circuits and explore the relationship between these three components.
Description: Follow the link to get a hands on experience with current, voltage, and resistance. Create your circuits and explore the relationship between these three components.
Quiz : Ohm's Law
Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.
Question #1

A 110V wall outlet has a resistance of 3.7 ohms. What is the amount of current flowing to the outlet?
 

Question #2

A 4.0-ohm resistor draws 3.5 coulombs. What is the potential difference in the circuit?
 

Question #3

A 4.0 ohm resistor is connected to a 12 volt battery in the circuit shown below. What will happen to the current if the 12 volt battery is replaced with a 6.0 volt battery?
 

Question #4

A 12 volt battery and light bulb are arranged in series. The ammeter reads the current to be 0.80 amperes. What is the resistance of the light bulb?
 

Question #5

A flashlight bulb with a potential difference of 4.5 V across it has a resistance of 8.0 Ω. How much current is in the bulb filament?
 

Question #6

What is the ratio of the potential difference across a conductor to the current in the conductor called?
 

Question #7

What is a measure of how much work is needed to move a charge from one point to another?
 

Question #8

Which of the following would reduce the amount of resistance?

Question #9

A constant amount of charge passes through a conductor. How is current affected if the same amount of charge passes in less time?
 

Question #10

Which of the following aluminum wires would have the greatest resistance?
 

Description: After watching the video and completing the reading, complete the following quiz.