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Faraday's Law (h2, Scene Summary)

ExampleTemplate*

Faraday's Law‬ is an interactive sim. It changes as you play with the movable bar magnet.

At the centre of the play area are a 2 loop and a 4 loop coil connected to a light bulb circuit. A voltmeter is also attached to the circuit.

The two coils are sideways,

both

each with openings on the left and right.

Magnetic field is

weak 

weak at the 2 loop coil, moderate magnetic field at the 4 loop coil.

Grab the magnet to play.

There are additional controls that change what is connected to the circuit, flip the bar magnet, and reset the sim. If needed, check out keyboard shortcuts under Sim Resources.

"Faraday's Law‬ is an interactive sim. It changes as you play with the movable bar magnet."

"At the centre of the play area" + (is a 4 loop coil / are a 2 loop and a 4 loop coil) + "connected to a light bulb circuit." /If voltmeter attached/ "A voltmeter is also attached to the circuit."

"The" + (coil is / two coils are) + "sideways," + (with /

both

each with) + "openings on the left and right."

/ If field lines visible - One coil /
"Magnetic field is" + (strong / moderate / weak) + "at the coil."

/ If field lines visible - Two coils with different field strengths /
"Magnetic field is" + (strong / moderate / weak) + "at the 2 loop coil," + (strong / moderate / weak) + "magnetic field at the 4 loop coil."

/ If field lines visible - Two coils, same field strengths /
"Magnetic field is" + (strong / moderate / weak) + "at both coils."

"Grab the magnet to play.

There are additional controls that change what is connected to the circuit, flip the bar magnet, and reset the sim. If needed, check out keyboard shortcuts under Sim Resources."

* Emphasis added for legibility

Play Area (h2)

Bar Magnet (h3)

ExampleTemplate

Magnet above right of 2 loop coil.

Magnet North pole on left South on right.

(Button "Grab magnet")

"

Once grabbed, W A S D and Arrow Keys moves magnet in 4 directions, 1 2 3 keys slides magnet left and right different speeds.

/ If one coil /

Follows "Magnet Release Text Alerts - One Coil" (see below), but the word "Released" replaced with "Magnet".

/ If two coils /

Follows "Magnet Release Text Alerts - Two Coils" (see below), but the word "Released" replaced with "Magnet".

/ Polarity

according to whether or not it's flipped

/

"Magnet" + (North / south) + "pole on left" + (South / North) + "on right."

Button: "Grab magnet"

"Once grabbed, W A S D and Arrow Keys moves magnet in 4 directions, 1 2 3 keys slides magnet left and right different speeds."

(question) Insert instructions on cursor moves and sliding. Make sure to mention that they have to grab first "once grabbed".

Controls Area (h2)

  • Checkbox
    • Label: "Voltmeter"
    • Aria description: "Play with or without voltmeter connected to light bulb circuit"
  • Checkbox
    • Label: "Field Lines"
    • Aria description: "Hide or show magnetic field lines."
  • Circuit mode
    • Aria description: "Experiment with one or two coils."
    • Radio button group
      • (Radio) 1 coil
      • (Radio) 2 coils
  • Button
    • Label: "Flip magnet"
    • Aria description: "Flip North and South Poles"
  • Button
    • Label: "Reset All"

Magnet Focus Text Alerts

EventAlert text

Grab magnet:

1st and 2nd time

"Grabbed, W A S D keys move in 4 directions. Press Space to release."

Grab magnet:

3rd

- 5th

and 4th time

"Grabbed, try 1 2 3 keys to slide different speeds left and right. Press Shift to stop slide. Press Space to release."
Grab magnet: 6th 5th time onward"Grabbed, also see keyboard shortcuts under Sim Resources. Press Space to release."
Grab magnet: 7th time"Grabbed. Press Space to release."
Brightness peaks and falls offSee "Bulb Brightness Text Alerts" below.
Voltage peaks and falls off
Release magnetSee "(Magnet Release Text Alert)" See below.
Bump Coil"Bumped coil"
Bump Edge"At edge of play area."

Bulb Brightness Text Alerts

The intent of this alert is help the user understand what is happening in the scene and reduce confusion when magnet is near a coil.

When the bulb brightness

...

peaks then falls off, a text alert is fired.

  • First 4 times this event occurs, text alert says: "Bulb dim" "Bulb Bright" "Bulb Very Bright"

"Dim / bright / very bright"

  • Subsequent times this event occurs, text alerts says: "dim", "bright", "very bright"
  • To avoid too many alerts, this alert fires only if it hasn't already been fired within a time window. Try setting this window to 3 seconds. If it seems too frequent, increase the time. If it seems not frequent enough, decrease the time.

Voltmeter Level Text Alerts


Magnet Release Text Alerts

The following diagram depicts the different text alerts fired when the magnet is released.

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