Indiana Science HS-PSII-7.2
The Standard
Develop graphical and mathematical representations that describe the relationship between the rate of change of magnetic flux and the amount of voltage induced in a simple loop circuit according to Faraday’s Law of Induction and apply those representations to qualitatively and quantitatively describe how changing the voltage across the device affects the current through the device.
Indiana Academic Standards for Science (2023) · Electromagnetic Induction
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students calculate how quickly magnetic flux changes through a wire loop. They graph that rate against induced voltage, then use the voltage and a fixed resistance to find current.
What Mastery Looks Like
- A student can use V = −ΔΦ/Δt to calculate voltage and show a straight-line graph with a negative slope. They can use I = V/R to find current and explain why reversing the flux change reverses its direction.
Common Misconceptions
- Students may think a strong, steady magnetic field produces voltage. They may miss that reversing the flux change reverses the voltage. Some assume current changes with voltage even when resistance does not stay fixed.
How to Assess It
- Ask students to sketch voltage versus flux-change rate, then calculate voltage and current when flux through one loop rises by 0.01 Wb in 0.10 s and resistance is 5 Ω.
Lesson moves
Ways to Teach It
Connect one wire loop to a millivolt sensor, move a strong magnet through slowly and quickly, and compare peak voltages.
Ask students to sketch flux and voltage over time as a magnet enters and leaves a loop, then explain the voltage reversal.
Give students flux-change and time cards; have pairs calculate signed voltage and current through a 5 Ω resistor.
Connect a hand-crank generator to a fixed resistor; students predict how faster turning changes voltage and current, then check with meters.
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