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Ohm's Law: Ohm's Law, Students Explore How Changing The Voltage (V) or Resistance (R) Influences Current (I) in A

1) The document provides tips for using a simulation on Ohm's Law to teach students about how changing voltage (V) or resistance (R) influences current (I) in a circuit. 2) Students should observe how changing the value of V or R changes the size of the current, measure the current for a given V and R, and track changes in the circuit as V and R are varied. 3) The simulation models circuits at the atomic level and represents impurities in metal with dots, and controls resistance by changing resistivity while keeping length and area the same.

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Mujtaba Hassan
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66 views2 pages

Ohm's Law: Ohm's Law, Students Explore How Changing The Voltage (V) or Resistance (R) Influences Current (I) in A

1) The document provides tips for using a simulation on Ohm's Law to teach students about how changing voltage (V) or resistance (R) influences current (I) in a circuit. 2) Students should observe how changing the value of V or R changes the size of the current, measure the current for a given V and R, and track changes in the circuit as V and R are varied. 3) The simulation models circuits at the atomic level and represents impurities in metal with dots, and controls resistance by changing resistivity while keeping length and area the same.

Uploaded by

Mujtaba Hassan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Tips for Teachers Ohm’s Law

In Ohm’s Law, students explore how changing the voltage (V) or resistance (R) influences current (I) in a
circuit.

OBSERVE how CHANGE the


the size of the voltage or
variable changes resistance of the
when the value circuit.
changes.
TRACK changes
in the circuit as V
MEASURE the and R are varied.
current in the
circuit for a given
voltage and ACCESS sim
resistance. features (sound
on/off, keyboard
shortcuts)

Accessibility Features

Description Alternative Input Sound


! !

Model Simplifications
• The black dots in the wire represent impurities in the metal lattice. Materials with a high density of
impurities have a higher probability of collisions between the electrons and the cations in the lattice,
which results in a higher resistivity.
• Because the length and area of the resistor is unchanged, the resistance slider controls the resistivity of
the material.

Sound Features
• The pitch of the slider notes is proportional to the size of the current in the circuit and not dependent
on specific slider positions. As a challenge: try to achieve the same note (same current) with different
slider positions.
• See the Sound Features Video for more useful tips on how concepts and sound are integrated in this
sim. For additional details on all sounds used in this simulation, see the published Sound Design
Documentation.

Hanson, Rouinfar, and Fiedler, November 2019


Suggestions for Use
Sample Challenge Prompts
• Describe what happens to the current in a circuit when the voltage is increased. What happens when
the resistance is decreased?
• Does changing the voltage of the circuit cause a change in the resistance of the circuit? Why or why
not?
• Explain why current and resistance are inversely proportional.

See all published activities for Ohm’s Law here.


For more tips on using PhET sims with your students, see Tips for Using PhET.

Hanson, Rouinfar, and Fiedler, November 2019

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